How to replace left front axle seal and CV axle, Chev 4X4
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- čas přidán 21. 08. 2024
- This is a step by step description of how I replaced a leaking left front axle seal on a 2000 Chev Suburban 4X4. Details of how to remove and replace the CV axle are also incidentally shown.
UPDATE Dec 2020: Today I uploaded an addendum to this video to explain why it is important to remove and seal the vent tube cover while you are in there. It is here
• How to fix a leaking l...
Starting at about 6:20 of this video you can see the vent cover which can leak axle fluid. Leakage from that plastic cap may be hard to distinguish from a leaking axle seal, so it is wise to remove and reseal the plastic cover at the same time. Because of access difficulty it is much easier to do that while the axle is out. The video update demonstrates how to do that.
This is a demonstration of amateur effort, published for entertainment purposes only. None of the information contained here is guaranteed to be accurate or complete. Do not try this at home! Any misadventure you experience if you decide to repair your vehicle is your responsibility.
Thunderclap sound used under Creative Commons 3.0 license, done by RHumphries at freesound.org/p...
great video, I'm doing this job on my 2011 truck in a day or so, thanks
Thanks a lot. Probably saved me a couple hundred $.
Worked on 98 gmc suburban slt had to grind the frame down a little to slide the axle coming for the dif straight out and I didn’t have the socket for the axle in the hub so I didn’t take that off
Great video. Thanks.
I had the left front seal changed on my '99 yukon and within 4000 kilometers it is leaking worse than before. The dealer isn't responding to my concerns but after watching your video i will check the vent before pursuing any further with the dealer. Having work done at the dealers seems to be a shit show lately. I've had to return for three jobs not done properly on this vehicle.
If it leaks again within about 6 months I'd complain. I doubt most would warranty beyond a year. Check to be sure it is not overfilled, I'd have to check the service data for the exact fill level. Removing and sealing that vent plug is probably within the wheelhouse for most backyard mechanics.
Great Video!
6 years later, your video is still helping people like me fix their 13 year old trucks! (both axle seals are leaking in my '06 Avalanche)
to remove the drivers side axle, I used a plastic tree felling wedge. Available at most hardware stores in the chainsaw area for about 5 dollars. I just put the wedge between the axle flange and the transaxle housing. Just a couple taps with a 2 pound hammer and it popped loose.
I used this method and it worked great. I had to trim my wedge about a 1/4" because the angle wasn't steep enough, but just like described, couple of taps and it popped free.
Glad to hear it, thanks for the followup.
burpton that's BRILLIANT! THANK YOU! Now for an easy blind bearing removal!
Thanks for the info
Excellent tip!
That's about 10 years later now. Good job. Just did on my LTZ 2006 both left and right seals. After watching some videos for the right side axle seal, I found that mine is different. My right shaft tube does not have any electrical connections to unplug. It is a simple straight tube and the axle with the O - ring inside. This axle just longer than left side one. The removal is the same. Bang, bang and it comes out. No spring or washers to watch out for like the shaft tube with electrical sensor connection. Perhaps my electrical sensor connection is somewhere and not on this shaft tube. Just feeling good that I was able to do it. Thank you to all who take their time to post these DIY videos.
Fuera bueno poder verlo en español muy bien explicado
as for the RTV Blue...I did the same thing on a rear axle seal for the same reason. First go around I didn't use it and the next week I was back in it. For such a small scratch it still leaked. After a thin coat of RTV, 156k hard miles later....still no leak. Let them say what they want. It works. I did polish it a little with emory cloth as well prior to application.
My friend wanted this as his funeral song , Rest In Peace Jesse Henderson
CZcams at its very best. Excellent instructional, thank you sir.
Thanks!
This video was extremely helpful for me. Very professionally done. You provided all the information I needed and more to perform this job with ease. Thanks for the Torque specs as well.
This is one of the best and clearest videos I've seen on this subject, thank you very much, I wish more people would follow your example. Thank you very much!
I wondered if that would work. When I did the axle seal on the right side, shown in another video, the way you describe is the way I did it. On this side I followed the dealers manual guide, which suggests doing it this way. The reason I chose a longer method was because I knew the C-clip would be a problem and I wanted plenty of room to work with. But it's nice to hear from somebody who was able to get it done a quicker way. Thanks!
Thank you my friend!. My lifted 99 tahoe with plow actually snapped the flange off the shaft. That was interesting trying to get the axle out without something to tap or pry against. Anyway, my c clip stayed in the diff as well and spun like it was in a groove so I wasn't sure if I had to try to get it out or not. Your video gave me peace of mind to leave it and tap it back together. Thanks again... Danner
Oh James, I'm honored to have you visit my humble channel. I watch your feed all the time, you've got an excellent, practical channel full of good teaching advice.
I went ahead and tried it. Got the shaft out fine. I did have to remove both the stabilizer bar and tie rod to get the drive shaft out of the way. In doing all that, I tore the dust boot on the upper ball joint, so that's the next item to tackle. My seal looks a little different than yours, but I did get it installed and the shaft back in the case. Everything turns like it should.
Thanks for your help, keep making great videos!
very good
Thank you, Terry. Last week I watched Briansmobile1 do an axle that would NOT come free of the knuckle. What a pain.
As you know you are planning a much more extensive repair, one that would be popular here on youtube if you take the time to film it. Thanks for your comments here, they improve the depth of the thread. Good luck!
Your demonstration was excellent. You were very helpful in your explanations and easy to follow. It looks like a fairly reasonable job to do for an average ability mechanic to do. A huge thank you for your willing to share your knowledge.
Thank you.
Noticed mine is leaking today while changing my engine oil. Thanks for posting this video-it is now on my "to do" list.
Let us know how it turns out, thanks for the reply.
Thanks for the vid. I was going to take mine to a garage, but I can handle the job after seeing your video. Thanks !!!!!
I'm glad it helped. Good luck!
Finished the seal replacement. There is an "improved" seal the dealership sold me that looks a lot more robust than the old one. Job went smooth. Thanks Again!!!
Great, thanks for the followup. Interestingly, one viewer mentioned that his parts supplier was selling a seal that needed to be installed 'backwards' compared to the OEM seal. His seal was labelled that way. I used a NAPA seal that looked identical to the original and it went in the same way as the original.
Just wanted to say thx for making this video, u gave me the inspiration to change out both of my leaky seal on my 99 z-71. Although i will say im a lil scared of that cclip on the half shaft just bc i dont understand how it aligns to pull out half shaft.
I just did my seal on my 98 k2500. I removed the sway bay link, ( both need replacing anyway) removed the axel, then tried prying with a pry bar. I didn't like prying on the aluminum housing, so I used a hammer and a small piece of wood and hammered on the axel flange while turning the flange. It took a little time, but it came out. The c clip was still on the axel, but looked good. Replaced the seal, being very careful tapping in the new seal, and all went back together well. I have good ground clearance, so I didn't even jack up the truck. Took about 3 hours. Now I am off for an inspection sticker. Thanks for the good video and info!!
Brad Davies read your comment on changing you axle seal. You said the c clip stayed on the axle, was is still "tough" tapping it out? Also, how is it doing? Any leaking, is it still good?
It took a little work, but it did come out. I did notice the seal was still leaking about a month later, witch tells me that the axel itself had worn a grove where the seal makes contact with the axel. I have since traded the truck in, as a lifter was sticking and I didn't want to remove the intake manifold to replace the lifter. Good luck with your project.
Just noticed tonite I have a left front seal leaking on my 06 Sierra, which is why I was looking here. Great video - thanks for the help!
Thanks, let us know how it works out.
Very good video . You explained every move in detail . It will make my job of changing out the left side seal on my Envoy much easier ! Thank you for such an informative video .
Nice job Dave! Yeah, those c-clips can be a PITA. I sure am glad to see you use some grease on the splines of your axle before you slid it in. There are so many of these videos out there where guys will just slide them in dry. I had one axle where the splines were totally rusted together. That joker took me about seven hours of penetrating oil, puller, impact wrench, etc. just to get the splines to separate. Not a bit of grease on there. Keep up the good work!
Great video and no annoying background music for a change. Two thumbs up!
Yes, I know what you mean, Thank you.
Thank you for a most complete video including the torque specifications and the minute observations. Since my local parts store has a tool loaner program I decided to go the slide hammer approach (I couldn't find my steel wedge I usually have for things like this). I welded two 5/8-18 nuts to a 1/2-13 coupler. The slide hammer had 5/8-18 male. I then used a 24" piece of 1/2-13 threaded rod to pass through the wheel hub and attach to the puller bracket. With the truck on stands I used the jack to raise the wheel hub to be nearly concentric with the differential. With a couple of slide actions the output flange stub came out. My local shop quoted me $450 for this job.
Thank you for an excellent and detailed video! Replacing my CV shaft and seal in a few days, this was very helpful!
had to remove both stablizer links to create enough room for the cv shaft removal on my 2010 silverado ....very good video thx
This is a great video. Well done. Not only did it help me, but it was enjoyable to watch.
Thanks, man!
Thanks. Aside from the C clip it was pretty straight forward. Thanks for watching, as always.
What do you do if the c clip doesn’t come out with it?
@@guyuntouchable4525 It didn't, watch from 5:50 to see what I did.
Thanks for the video! Will be swapping axles and hubs soon... it's good to know I've identified all the parts down there correctly!
Thanks for the video, very helpful. You must be a nurse or Paramedic. I've never heard a mechanic use the word patent describing a unobstructed breather. "Clear" is the word most commonly used but I knew what you were saying.
Thank you. It's at the age now where things are going wrong, making it fertile ground for lots of repair videos (grin). Why would anybody want a new car when you can have so much more fun with older vehicles....
Excellent vid, proper lighting, shows all relevant info and sequence, give approx torque. Everything most of the other vids didn't have.
Thanks, man.
Thanks for the video. My son just wobbled my 98 z71 home. The driver's side wheel is at almost a 45 degree angle. Not sure how he even got it home. The cv boot at the wheel has grease all over the place and you can see separation at the back plate. Probably a good chance I will have to replace the wheel/hub assembly as well. It's ugly. I've never replaced a CV axle before but your video makes it look very straight forward. Thanks!
Thanks, You just saved me a ton of work. My passenger side is leaking plus I need to replace the half shaft as well on my 2003 Silverado.
Thanks for the video you just inspired me to do mine. Long over due and getting sick of adding fluid and cleaning up drip marks from the driveway.
Thanks and keep them coming.
Kevin Frost Thanks, man!
I rarely subscribe to anyone but your vids are so well done. No nonsense and simple without leaving out details. I love videos that say "today we will rebuild our small block. Disconnect the battery cables. Pull engine. Rebuild. Replace engine. Reconnect cables. ".
Well thanks for details? Lol!
I have a 97 blazer and I was hesitant to get into this one until I saw your video. I know anything involving axles can be problematic and usually requires tools borrowed from NASA.
Seeing your videos makes me feel way better about this one. I have no doubt I can handle this.
Thanks for the great video! Keep it up.
P.s. Do u have any videos on how to keep a woman happy?
Ha ha, very funny. My wife keeps telling me I should post a vid of how I dye her hair in the garage (grin). Not happening.
Thanks for the vote of confidence, and good luck with your project! One of the problems with DIY auto repair is the unexpected complication, like a stripped screw head, a broken or crossthreaded bolt, or a broken plastic part. When things go well, repairs can look deceptively easy. I wish I could reassure people it won't happen to them....
Awesome video mate, thanks a lot! It definitely helped me to identify the tasks and buy the right tools. Now all I have to do is wait until the bearings and seals arrive. Oh yes I also may have to replace the bearings...I already feel freeplay on both axle shafts. Cheers! P.S. the torque specs you mentioned were a nice touch!
Great work. Doing something like that, especially if there are complications, leads to wisdom that is hard to measure. Thanks for the update.
thank you you saved my friend alot of money me and him got it done quick cause we didnt have to go through trial and error process
I'm glad it helped, thanks for the feedback.
very well done.. the video.. you narrated it very well. i have a'89 chev silverado, and im thinking about doing an axle re/re myself.
KyleCarrington Thanks, man. The tricky part is the snap ring inside the diff. Hopefully it slides out for you, without difficulty.
very very good video thank you I get to do that to one of my buddies trucks here in a couple of weeks now I know how to do it thank you again and I feel for you laying on the ground doing that
Awesome Job!!! You've found your calling, thanks for the great info. It's one thing to be mechanically inclined and another to have have experience. Couldn't have the latter without good people like yourself!!!
Yeah, it's a pretty simple repair. Have a look at the vent tube to be sure it is on securely and not blocked.
Perfect instructional video. I appreciated you giving a tour of the front end while under there. Thank you so much
i was in the waiting room at the chevrolet dealer when another customer was being quoted the estimate to change both seals. I don't remember the number but it was attention getting. On my 2002 I was surprised to discover that the steering column does not lock ( at 9:00 or so you mention turning the key to allow the steering wheel to turn) maybe that is a difference between canadian and us models. Keep up the good work, I really enjoy the content and the production quality of your videos.
My 2000 went bad last week. Thanks for the preview of my near future! Well done, i might add.
Good job man, your Video was just what I needed. The Chiltons manual says to pry it off with a large screwdriver or two. We all know that it's not good to get crazy a pullin & a pryin against an aluminum housing of any kind. And it sure doesn't come out as easy as the book makes it sound. Great Vid! Thanks!
You can use a 2x4 and place it against the flange and tap it out with a hammer. Same concept that he illustrated in the video, just different tools.
This is the best video by far on this. I'm changing the bearing behind that seal while I'm there though - I picked up that info from other video's... I had to buy the hammer/bearing puller like yours for the bearing and probably have to take a couple more things apart to enable the straight pull. Doing this myself will more than pay for my new puller :{ ) Thanks for posting - Was very helpful
Great! Pay it forward and video your effort, it is rewarding to contribute to the general knowledge base. You never know where this can lead, ha ha.
@@spelunkerd You might not want to see it, as I'm currently limbering up the courage with a couple Rum & Cokes (not a sponsor) lol. I'll be getting at it right away though, and will share any Highlights if warranted - I'm pretty sure you nailed it though , and won't need to add. Cheers & Enjoy Your Weekend bud !!!
@@spelunkerd Ran into problem with my stabilizer bolt not able to be removed unless I wanted to cut it or take apart ball joints.Mine were different with bolt from top and nut on bottom with no clearance to remove. I changed the seal by just taking out six bolts. I tarp strapped out of the way and / like you gently tapped with a hammer - not kidding real easy and just a couple light taps as I turned it. pried seal out - bearing seemed ok after all so just left it in the end... Leak fixed after a good test drive A OK
Good video! Do you know if the procedures are the same for 2011 Suburban 2500? Thanks!
A few viewers have noted that they were able to remove the axle seal without removing the CV axle or the wheel. If it works you'll save time, though it may be a little harder to maneuver with the axle in the way. The way I did it is the way the dealers manual explains how to do the job. However it wouldn't be the first time that techs found a time-saving short cut not mentioned in the manual.
I cant thank you enough for this video. You saved me a couple hundred dollars. I too did this without removing the CV from the hub. Yeah it woulda allowed more room but it saved me a trip to the dreaded dealership.
Great video. My passenger side CV boot just blew on me. This video is a great help.
I'm glad you liked it. The repair is pretty easy if you have the right tools and safely take your time. I did the passenger side intermediate shaft seal on this vehicle, shown on my channel. The two sides are not identical but the principles are similar.
Great video; super helpful. Job is less complicated than I thought. I have the factory shop manual for 89 3500K but this video completes all the information I have. Thanks
I have a 96 suburban everyone told me to use dexron for my fluid.good video.
mark bryant I use dexron and I've had no problem with it. Others on the 'net complain that it sometimes gums up, causing lots of issues. I think many of those problems are a consequence of overheating, and I wonder if dexron is particularly susceptible to formation of residue when overheated. However there are antioxidant properties that advertisers say is an advantage. If you do switch over, drain everything first to avoid incompatibility issues.
smooth camera work, transitions, editing in general. i enjoy workin on my truck and watching others work on similar Chevy truck models, even if i know i wouldn't be able to do the same repair/service.
Thanks very much for this video spelunkerd! I used it today as a reference while changing the seal on my 98 K1500. I also noticed that the snap ring remained inside the housing, so I assume that it's normal. I would just like to add that I had a lot of trouble pounding the shaft out. I found that tapping the shaft into the housing first freed up a bind in the snap ring and then it just popped right out. Thanks again!
Good point!
mine was a 99 k 1500 suburban maybe frame is different on 99 than 2000
At 6:16 you get a good look at the vent tube, centered in a large plastic cap with a central 24mm hexagonal nut at the base. Some versions of the Chev diff are prone to leaking around the threads of that cap, and if yours is leaking then now would be a good time to remove the cap to seal those threads. It is often hard to tell if leaking oil is coming from the vent cover or the axle seal. I show how to reseal the vent cover in an updated video, here: czcams.com/video/KvSysO3zQos/video.html The cap needs to spin off to allow a peek at the diff gears when adjusting backlash and when painting gear patterns. So, any sealant applied to the plastic threads needs to be nondrying so you'll be able to get it off in the future. Never-drying silicone paste or teflon tape would be reasonable choices, but probably not silicone caulk.
Great job. I have this exact job needed on my truck and this was clear as to procedure and tips.
Thanks, I'm glad it helped. Many people have added remarks in this comments section, and some of those comments are worth scrolling through, too. Good luck!
Thanks 💕🇨🇦🙏
Greetings, I once lived in Calgary, Lethbridge, and Edmonton. Thanks for watching!
@@spelunkerd Awesome 👌
Very well filmed & narrated video thank you very much!
Excellent posting! My '06 2500HD looks to be needing this seal. I know it's a different diff, but I can see that the procedure is the same. It'll be MUCH easier when I get down to it. Thank you!
My little brother just paid 325.00 to repair his passenger side. well worth the price. Thanks for the knowledge.
Great instructional video. I’ll be doing mine this week
Awesome video! I really appreciate all your vids. Guys like you are empowering people like never before. Thanks for what you do!
Thanks Eric. I felt the same way when I first came to youtube! The guys who did those vids helped me a lot, and it was the driving force behind my effort to pass that on. What a huge difference a few years make, the knowledge base is huge now... What a great feeling, to be part of something that is larger than any one person.
It's great to have feedback that the faster option works here. Thanks for your contribution to the thread.
thanks for this video... It helped to know what the mechanics will be replacing (seal). God bless.
You're welcome, thanks for the feedback.
You did a fantastic job, very educational!!!! Well done👍
Thank you.
My little brother just paid 325.00 to repair his passenger side. well worth the price. Thanks for the knowledge..
WILL BE DOING THIS MONDAY MORNING ANY IDEALS WERE I CAN GET JUST THE SEAL AUTO ZONE HAS ONLY KIT
I got mine at NAPA. Note that one person noted in the comments below that the seal he got was designed to go in 'backwards' compared to how the OEM seal goes in. His seal has small lettering on it, showing which side was out. I would look carefully for that lettering before installing yours. Mine had no such lettering so I put it in the same way the OEM seal was installed.
So helpful! Thank you for taking the time to make these videos. I have to do the outer bearings on an 03 very soon.
Thank you for the feedback, Jordan.
Hey, thanks for the great video.
Is the axle seal you replaced the same part as the axle seal i see when i remove just the cv axle?
This 4WD axle comes apart in two pieces, but the seal performs the same task as others. For part numbers, I ask my parts dealer for help, or check online from places like RockAuto.
I have a 2001 Suburban 1500 and will be replacing the tube bearings and seal on the same side( there is significant play at the diff as well as lateral movement) so this video has been great in prepping for that job. Im toying with the idea of removing the entire front diff assembly from the truck and replacing both seals and bearings on the bench but I fear Ill lose my leverage advantage with it not being on the truck...
Thanks for adding that, it helps others and improves the thread. I'm looking forward to watching (grin).
yer video is done very well is to fallow with clear explanation of changing the seal.. thanks much ..
Wow, super fast. What did you pry the seal out with?
I used a large flat screwdriver, but a seal puller or any prybar would work. If the last guy used RTV it may put up more of a fight. Stay away from 9 o'clock, you don't want to damage the sheet metal locking tab underneath. See the linked recent video for better explanation. Good luck!
I have to do this to my 08 Silverado. One video I saw to remove the Differential Case then place it on a bench to knock out the shaft. You did luck out on the C clip. Wish me luck.
thanks for the vid .I just did mine after watching this vid. Less than an hour. You dont need to stick it 4wd if you use an impact gun to remove the bolts and I didnt remove the sway bar link bu did remove the sway bar to frame mount bolts and which allowed the driveshaft to slide out.
Thanks for recording your experience here, I'm sure others will find it useful.
Did your stub pop out fairly easily?
I have an 02 escalade and just replaced the same driver side axle seal, but when I set it inside the diff it has some wobble
You may need to take the front diff cover off to see what is wrong. I did a couple of videos of an axle seal job on a Dodge Ram, and to do those you need to take the diff right out to get at the inside drivers side seals and bearings. If the inner bearing was pushed in when you put the axle back, you may need to replace it.
@@spelunkerd Ok, I'll take a look at them thanks for the help👍
Fantastic video - super helpful and precise....Great Job !
Great video. Planning on doing the seals on my 2010. I would imagine it's the same concept.
Probably, I'm not sure. I use Alldata, but whether you use Mitchells, Alldata, or an ebay copy of your dealers manual, it would be wise to check that out first. Have a close look at the CV joints as well. Sloppy movement of those joints could cause your seal to leak. Good luck!
Yeah, I think the method used here is fairly common to many models and years. Thank you for watching.
@Dave FYI the axle ratios are the same (they have to be) front and rear but if you have a limited slip rear you must use full synthetic for the limited slip clutches to work per GM. Mine takes 75W90 full synthetic in the rear (I have 373 limited slip) and 80W90 reg gear oil in the front of my 2001 Suburban.
Thank You for this video. I replaced the Left Axle Seal this past weekend with the aid of this video! A couple of tips that worked for me. I used 2 tree felling wedges (as suggested in the comments section) and worked like a charm. I also put the new axle seal in the freezer overnight. Not sure if the freezing was the reason why, but the seal install was much less painful than my past experiences. thx again
well u forgot to say about the frame in the way of the shaft comming out had to grind down the frame to get it out
There was no grinding of the frame required in my vehicle, perhaps yours is different. Remember you can turn the steering wheel and move the position of the steering knuckle, and also you can bend the CV joint to slide it out. You can see that I removed it with one try in real time on the video....
Hey Mike I just did this on my 98 k1500 and the shaft stub didn't clear the frame rail like you're describing, what I did was remove one of the bolts holding the diff housing to the frame and pivoted the diff down by prying between it and the frame until the shaft cleared. You shouldn't have had to grind the frame, that was probably a bad call because these frames are known for cracking as it is.
Great video. I'm certainly going to give it a try. Looks a lot simpler than the RT side. And good to note that I should get the slide puller before attempting.
Hi. Great video, i'm about to do this on my GMC Sierra 1500 -99. I hope it's the same procedure on my truck.
Can't say, but they are probably similar. I have a dealers' repair manual for all of my vehicles. You can get them in CD form through ebay, from an online service like Alldatadiy or Mitchell, or from the dealer. I prefer the online form because you get updated TSB's.
spelunkerd I can say that it is exactly the same on my gmc and your chevy. Thanks man, great vid. 👍
Enjoy your videos. Keep em coming as it saves time and money when I can do the work myself and at my leisure. Would love to see front differential replacement on a 2500hd in the future as I may have to replace mine soon. Thanks again
Thanks. Unfortunately my front diff is working fine (grin). You should turn on the video camera when you do yours, ha ha.
You explained it very well and you did a great job on your video, thanks.... Keep up with the videos because they are very helpful to us all.
Great video! Thank you so much for taking the time to make it and help people.
appreciate the video, very informative and exactly the info I was looking for. have to say one of the better vids I seen
Thanks, man!
Good vid I am sooo glad I have a 2 post lift don't miss working on the ground
Yeah, I know what you mean. I thought about installing a lift in my garage but I would have had to lift the roof to do it. Not worth it. Thanks for watching!
What if that little metal tank that is stick out holding those teeth in place, is broken off.
If you mean the C-clip that holds the medial part of the axle in place, then you will want to remove the broken parts and replace it with a new one. If you can't get at it from the outside, you'll have to remove the diff cover, remove the diff, and get to it from the inside. If you mean something else, leave a better description, maybe with a time stamp for the stage of the video showing the part you are asking about.
spelunkerd wow I just saw how poorly worded my comment was. Right at 6:00, you stick your camera to see inside to make sure the C clip was there. The metal tab that sticks out, is broken off on mine. I actually went to my local GM dealer yesterday, a mechanic told me its part of the whole axle case, which I could believe but I’m having a hard time understanding how it’d be a permanent piece to an axle case.
Hi thanks for making this video, I have 01 Chevy Tahoe my question is the seals are the same for both sides for front differential? I have to replace the right side I should just replace both sides while at it thanks
The seals are different. In view of the unpredictability of how easily that stub shaft comes out, I wouldn't want to be in the situation of cussing over a task that wasn't absolutely necessary. In the amateur world you can always revisit that left seal at a future date without an extra labor charge you get in the pro setting. So, in my shop I try to avoid doing anything that isn't clearly justifiable.