1978 Firebird Project Speedometer Gear Choosing and Install (Ep.10)
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- čas přidán 12. 12. 2019
- This episode starts out with a leaking speedometer gear housing seal on our 1978 Firebird's Turbo 350 transmission, but when we decide to replace the speedometer gear with a more appropriate one things get a little more complicated. The speedometer has never been quite accurate and we will do some number crunching to figure out the best combination of gears to give an accurate reading on the factory speedometer.
Dates of filming: September 12th, 2018 (Speedometer Gear Removal)
September 24th, 2018 (Speedometer Gear Reinstall)
Song List (Order of First Appearance):
0:01 Lone Trail - Silent Partner
5:06 Mysteries - Dan Lebowitz
8:41 The Hours - Topher Mohr and Alex Elena
11:52 Golden Days - Topher Mohr and Alex Elena
(All music provided by CZcams's Audio Library royalty free.)
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Check out our second channel for a variety of other content: / @fuzzydicepastimes - Auta a dopravní prostředky
Damn dude
I am attending a wedding and also I'm part of the groomsmen that have to be on the altar
It's about to start and I am watching this hoping I can finish it before this thing starts and I have to walk the aisle
Priorities in check my man
How did it go ?
Who gets married on Friday The 13th? You at Jason Voorhees wedding?
@@lachlanjohnson8019 Ok... So who gets married at high noon? You go to the ghost of Gary Cooper's wedding?
Playback speed set to 1.5
It's been a year, how's the happy couple?
It wasn't leaking it was just an automatic speedometer cable oiler
Yay the 1978 firebird! I missed this car
the return of the OG firebird? all of my yes!
The numbers on the speedo housing indicate which gears are compatible with the housing . The bore in the housing is offset depending on the odds of the driven gear to get proper gear mesh . While putting a 34 tooth gear in a 36 tooth housing might work , eventually because of the mismatch it will strip the teeth . Use a speedo housing with a 34 on it and will last forever ! Love your channel .
Yes we back
The other thing my old boss taught me on a speedo that likes to bounce is to remove it from the gauge pull out the inner cable lube it with petroleum jelly because the cable can get dry works really good just leave the last foot unlubed near the gauge
Massive thanks for this video. I was able to replace this part in my 81 TA after scratching my head for months looking for the leak. No more leaks and with your video it took me no more than 20 mins! Exact same problem with the plastic gear wearing too much. You are my hero!
Very informative. Very helpful. Wish I had found this a week ago when I didn't know these things. I'm repairing TH350 leaks on my '81 Trans Am and spent a lot of time finding the right speedo gears to best match my 3:23 gear ratio and stock tire size. Going with a 15 and 36 tooth combination and installing all new seals. My speedo housing is exactly like yours. Thanks.
I just did my drive gear from a 18 to a 15, my speedo was 10mph fast at 55 so i found it well worth it, still love watching the videos
I was really surprised when I saw my name on your patreon list at the end. Keep up the good work man!
Man, I just love your videos. Thanks for going through the trouble to do this.
if you wonder why the seal was in the wrong direction its simple . When those seals started to leak it was because the gear shaft was wearring out and at the time you could only get the gearshafts at the dealer and we all know how much a part at the dealer cost . so people re-used the same gear but flipped the new seal in order to avoid the new seal seat to end up in the same wear down spot as the old one . problem solved and you could continue for a few thousands miles this way . The only problem with that method is that a seal seat is made to retract on the shaft from the pressure created by the warming up of the ATF fluid creating a thighter seal in the pprocess . if you flip it then the pressure from the ATF temperature will cause it to expend outward instead of inward like it does when its installed in the right direction . I've told my clients back in the 70's and 80's to stop doing that and explained to them how seals actually work and that doing that is only a short solution to stop a leak and will cause an even greater one in the future because of it and that by flipping the seal you open it to contaminations coming from outside and that can create accumulations of dust inside the pumps of the trany . Even if a trany filter is made to filter very small particules it has its limits and some dust particules are even smaller than the filter can handle and a build up of it may take a lot of time but will eventually lead to trany failure
And the plug is machined offset center for the plastic driven gear, this allows for gear mesh adjustment. Like a cam. The shown tooth counts on the plug are indexed for where to stop counter clockwise rotation adjustment to those common sizes.
What a treat to see this notification after work
Fluid looks good
Hello, awesome video pls dont stop making this type of videos.
Good gravy for dinner it takes so long between videos that I have to rewatch the older episodes again
great job and thanks, im about to do the same. just need to calculate for 373 rearend
Automatically liked, I love your videos man!
some of those B.O.P transmissions are a universal bolt pattern. they can also bolt to the chevy pattern. they will have extra bolt holes that aren’t used when they are bolted up to a chevy engine
Great video
Always quality content this is so good
I went through this on my Blazer. The original owner had replaced the trans at some point and the speedo was off. I tried to fix it, broke three speedometer cables until I figured out that the pencil gear itself was broke. I had a reputable transmission shop fix it for $140. Was perfect after that.
Cool. A nice surprise to break up the monotony on my cross country flight.
Keep em roling bro!☺
1:51 Not sure of the years, but they also made universal TH350s, with both bolt patterns as well. BOP + Chevy on the same bell housing.
I love this channel
great video tbh keep it up
Besides the confusion good vid lol
I utilized 295 50 15in on rear with 235 60 15in front. Height is darn near identical and fit better than 275 60 15in which require jacking up rear to gain clearance. Although for day to day driving i prefered 215 65 15in all season tires on my 78 bird.
I wanna see a classic ford on this channel!
Perfect example of why computer controlled transmissions are more convenient. If you change tire sizes all you have to do is multiply the current tire size by the MPH %error and you're done.
But did you top off the ATF haha?
Great vid as usual, always a treat!
Thank you for this video. I am installing a new housing and gear as you showed but have on question. The retainer fork shaped clip does not touch the housing when tightened down and the housing can be wiggled a bit. Does this mean I need to bend the retainer clips to put pressure on the housing?
You need to do this job on your buddy's XJ... Open Jeep catalog, turn to page with gears, select tire diameter, order gear. Done. No math. ;)
Also no cable! Not a fan of cable speedometers after many, many, many years of owning cars with them. I like their electric brothers much better.
@Lassi Kinnunen You're exactly correct, and on another vehicle I have had a speedometer recalibration box that did exactly as you've described. The difference being that Jeeps (at least Wranglers, so anything sharing much with that platform gets the benefit too) are insanely well supported. So, it's like $12 to order the correct gear for a Jeep and another 5 minutes to put it in. You can't mess with the electrical side any faster or cheaper than that.
Very informative video! Did you guys check the accuracy of the speedo on the road? You can use a app on phone now. In the old days you got someone with good speedo to drive beside you with walkie to match each others speed...
My speedometer would just have to be incorrect before I attempted all this math and research lol
I didn’t realize a car like that would have such a high gear ratio, being at 2.42. No wonder I thought your videos of accelerating it seemed kinda slow!
This channel is amazing. Keep up the awesome work!
the things we had to do before computers and sensors
Side note, if you had access to one, couldn't you 3d print a proper gear ratio using a high end plastic like nylon?
Have You checked the speedo readings against a GPS app?
I have a 78 TA....400 with TH 350 and have the same speedo leak, however under examination of mine, I have a gearbox looking thing that attaches to the housing and the cable runs into it. My question is....why is it there? and secondly, as seen on another video, said wasn't necessary to install....can I just run the speedo cable directly into the housing?
Nothing can stop me not even winning a thousand dollars at a party I could not help it
Did I accidentally click on a math channel?
I had a wrong speed reading by some 11,5% (less speed) after I fitted my off-road truck with bigger tires. Instead of messing with the speedometer, I installed a speed app to my cel phone. Easier and much more accurate.
On vehicles with an electric speedometer you can fit a recalibration box that allows infinite adjustment and installs in about an hour. Super easy and no messing with your phone. Just a thought. I bought my box from Dakota Digital.
Maxwelhse I agree, but my offroad is a 1997 Land Rover Discovery. I don’t think it has an electric speedo. And even if it had it, being an English car, it wouldn’t be working. 🤣🤣
@@paulog8813 LOL... Poor British car. ;)
Do you have a part number for the rubber seal handy? I need to replace mine as well. Thanks!
Never mind. I found it!
Working out the tyre rotation per mile made my head hurt
I need to change my speedometer gear as well, the mph is way like 30mph off..I went from 2.80 gears to 3.42's...😑
did you do it? wondering what gear color you chose?
Wasn’t there some damage to the housing at the end the cable attaches? It looked very rough/uneven, as if some metal had chipped away. Perhaps that’s as it’s supposed to be?
It looked damaged but I doubt it will cause any problems since the thread behind it is in good shape
tomas bissio True, although the cable housing butts against that surface, so I wonder if it might leak a small amount.
Jaaaaaaa 😄
9:25 uhh ouch
If you put out a catchy song about the firebird then you would have a bop about a bop #nextproject ?
I would use self amalgamating tape to keep the juice in, draw lines over the speedo referencing GPS speeds.. Much more sensible? What ever works I suppose.
There's doing something, and there's doing something with style. Lines over the speedometer face screams "no style." Geez. New seals are a couple bucks.
@@jakester455 Yep thats why I asked the question ?? much better to fix it right the first time
the firebird would have had either a Pontiac or Oldsmobile engine and transmission from the factory. they didn't start to have "Chevy" style power trains until the 1982 model year when the 3rd gen was released. 1981 was the last year that Pontiac made their own engines and used them or Oldsmobile power trains in Pontiac cars
1978 was actually the very first year that the sbc was being installed in them from the factory.
If it came with a chevy motor it had a chevy th350 trans "turbo hydromatic" never a bop buick,olds,pontiac transmission
Wtf is that bellhousing? Why is the flywheel and converter so exposed?
Are you ever gonna get an updated paint job?
I hope not. The car just needs an appropriate nickname.
The Brown Frown Upside Down!
@@TheBrokenLife lol but I just think it needs a freshen up ya know?
@@Masonjarislit Naaa... That's not FDP's thing. When you cut a hole in the hood for a craigslist blower, you've got your priorities in the correct order.
@@TheBrokenLife yeah I know but it should just look a little fresh.
You can't just leave a firebird unfresh like that
@@Masonjarislit Growing up back in the days when those cars were everywhere and no one really cared about them, it just looks sorta "normal" to me. He'd have been the biggest pimp in the high school parking lot in 1985! :)
Check speed with a gps, google maps will do it.
All that math made my brain hurt
I was going to say the same thing. Flunked math all through school and didn't understand any of it lmao
Sorry, but the "F" is not a load rating, it was just an arbitrary letter used to indicate the diameter of the tire.
You need to sell the jimmy. And then paint one of the birds! If it were me, I do the 78.
You couldn't paint a hall closet for what his Blazer would get at sale. That truck is awesome, and needs to stay right where it is, but it's not valuable.
I just use Google maps' speedometer these days
You never truely fix a "Seal" issue. They will always come back. Limited only to how long the seal can survive form.
Just get a GPS speedo it's accurate and looks better
Who is “we”? It appears to be one person am I missing something? Almost every sentence has “we” in it. I really want to know who “we” is? Is someone else doing the work while you speak and commentary the video? Thanks
Boring af
first
Venom 1 view 2 likes! 😂
I am honestly on the verge of losing interest in this channel. These small videos and very very slow uploads are getting boring. You have some much content and failing to release it.
If you come here for entertainment dont bother this obviously is a channel built for informing people about old cars if you dont wanna learn that that's fine but I'm sure they're some other channels worth your time. Me I'm all for this. I want to learn about older cars
@@nyquilforthekill1620 you obviously don't comprehend plain English or too ignorant to understand, at no time did I say anything about the learning potential or entertainment. If you are looking for something to teach you how to work on old cars, get off ya ass and go work on one. Videos tell you half the story.
@@ericsmithers2952 oh but it's slow and boring when is learning ever fast and fun maybe you just dont get what you insinuating. And it wasnt meant as an insult so hike off.
@@nyquilforthekill1620 slow and boring, you mean short and lacking.
@@ericsmithers2952 Eric nothing about that was shirt and lacking he described how wheels and tires affect your gears and how fast your speedometer clocks you at it's a very cool subject for older cars because if you wanna build anything crazy to be able to do so and still have everything work the way it should you would want to do this. He emphasizes the fact that the difference between his driven gears is not correct maybe for his tires or his transmission and understanding it more helps one in the future with tires or wheels or even getting a better hearing out of the vehicle while preserving gas and milage. Aka. Getting the most out of the car. I found it intriguing man idk but that me. Look I'm sorry if I offended you as I did not mean to but I need to and want to know this I want to be a better mechanic and someone who can specialize on doing part overs for various makes and models of gm and what not.
un subbed because you have background music.