Driveline angle on vintage mustangs and rear leaf spring cars!
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- čas přidán 6. 11. 2022
- A topic that always is in controversy. Driveline angles! This video shows the steps i went through to cure vibrations after a t5 transmission swap. What worked and what didnt. Enjoy!
#driveline #pinion #vintage #vintagemustang
#classicmustang
I have this exact same problem in 63 falcon! I’m trying this!! Thanks!!
Thank you so much for this and going into great detail on this i have had the same thing happening with my 66 mustang. I replaced my transmission with the same trans c4 and I have been experiencing the same thing. My thinking was on point with you and I was going to check my angles on mine. I have been putting it off but now I’m going to get it done now that show season is done for.
Quick tip, start watching at 14:30
Dude, I've been chasing a vibe above 40 on a custom 66 Chevy c50 western hauler for months. New driveline, ujoints, poly engine & trans mounts etc etc. Pretty sure this is it, I'll get some wedge shims.
You're the man!
Great video. Well explained and has given me something to check on Datsun 810 wagon leaf springs I have. I've got 6 degree shim to lift diff upwards but it's actually slightly higher than engine angle. Will get a smaller shim or remove one in it. Everywhere I heard to make parallel but you're right they should be rotated down slightly to allow for spring wrap upwards.
Yep I agree, What I did helped out tremendously from what Randy stated above and in video. But According to the tremec driveline calculator, I am still in the red on angles, but not by much.. I still hear it very very and I mean very slightly when I drive and it is once in a while, so not sure if its the grade of road on slight down hill, or rough road or whatever it is ( it could be that I am just slightly out of green calculation zone according to tremec ap), and its not all the time. But my gosh, big improvement, it was all the time, and very loud before, especially at high speed on coasting. So in the future, I might try shimming pinion down 2 degrees. When I plug numbers into Tremec driveline calculator, It gives me all green on all three calculations on angles, by shimming down 2 degrees on pinion, and that is estimating driveshaft angle by adding 0.5 degrees down more on driveshaft. Cause that angle will change when shimming 2 degrees down more on pinion. But I could not achieve anything, unless I shimmed transmission up, like randy stated above. I tried all scenarios with driveline calculator, without shimming trans up. I always got red calculation on tremec driveline angle ap and driving proved driveline angle calculator ap was correct. Cause driving car really sucked with vibration noise. So in the future I might shim pinion 2 degrees down from level zero, and try driving it, and see what I come up with. If it is even better then now, then the tremec ap stands correct.
Anyway, better Thank Randy for setting us on right path. Who knows where we would be right now trying to fix this... All other videos on youtube, had me on the wrong path, for my set up only.
Randy, I have 66 mustang that I did the same swap tremec t5 trans. Its a 6 cylinder with alum cylinder head and removable 4 bbl intake. When I first did swap with stock 6 cylinder rear end (7 1/4 rear axle), everything worked great. Later on the 7 1/4 inch axle blew up, then I went to a 4 lug 8 inch axle with 355 gears and a eaton tru track posi loc in 8 inch axle. I had to get a custom driveshaft for swap. After this up til even just today, I have been chasing a vibration resonating noise at 55 mph and up. Below 55 mph like a switch it goes away. I really feel it at coast or neutral over 55 mph. I had this car up to 110mph max speed for this modified little six cylinder, It is really loud coasting or a load drive at real high speeds. Put trans in neutral, same noise never goes away til 55 mph. I went all over, like you said driveshaft re-balanced, tire balanced, bought another wheel installed that wheel in each position, wheel bearings changed out, changed out one new axle that I thought I had a bent wheel flange, removed third member from 8 inch axle and had it looked at, even installed a 2 degree shim up on pinion.you name it I did it. I drove like this for about 8 years. Sick of this noise. Today I just took driveshaft out, after I took angle measurement on shaft and measured drive angle on rear axle pinion, and transmission output shaft with car on ground and came across your video. My measurements using a digital level that read that reads degree are 5.2 degrees down on trans output shaft, 2.4 degrees down on driveshaft, with 2 degree shim wedge installed to raise up rear axle pinion. My rear axle pinion measures just about 2 degrees up.
(5.2 degrees down trans, 2.4 degrees down driveshaft, and 1.8- 2.0 degrees up on rear pinion) If I remove shims from axle get rear axle at zero. Shim up trans mission to at least to 3-4 degrees down. I will try this, Maybe even rotate wedges to move pinion down 1.8 to 2.0 degrees down. Question on transmission mount. Did you still have enough threads sticking down pass the rear mount. How thick was your shims/washers that you used to get this to come up. If this works, thank you for your info. My gosh we went through a lot of stuff and money past 8-9 years. Crazy...
I have 3/8 inch of shims underneath mount and still had the full nuts worth of thread engagement- good luck with getting yours worked out 👍
@@fix-itrandy3724 Randy this noise is like 99.5% gone with just me in car. I thought I heard it slightly at 90-95mph, but I mean slightly with engine accelerating to that speed, so it was hard to hear it, but coasting in neutral, in gear letting off the gas no noise completely gone . Seriously I am stoked with this results. What a big battle for me just like you almost 9 years. Couple things that I did to run this by you. In the past, I replaced c4 trans with tremec t5, like you. I had stock 7 1/4 inch rear axle, replaced it with 8 inch axle. Had a new driveshaft made and balanced. I have a inline 6 cylinder with alum head and removable intake. The weight reduction between the old heavy cast iron log head replaced with alum head, and the way heavy c-4 compared to the tremec t-5, my front end was raised up from stock height from reducing weight. 3/4 inch up from stock height. To me I thought it look weird. This past winter I replaced stock 6 cylinder steering parts with v8 steering parts, including the beefer v8 spindles.
I cutoff 1/8 of a coil only to bring down height to stock height while I had springs out. It dropped the height perfect, and brought it done 3/4 inch lower. Looking at it from the side, looks like stock height and looks perfect to me. Might even be a slight lower then rear, But looks great to me. That changed driveshaft angle. But no change in sound from problem that we had with driveline vibration. After seeing this video you made, I was determined to try this. I cut floor out carefully with interior still in, and covered up.
I only put a .25 inch thick flat steel shim between trans and trans mount to raise transmission up. Not frame mount where rubber trans mount studs go through. I did remove 2 degree shims in back of rear axle that I had installed years ago, so I am sitting just about zero rear axle.
My new driveline angle now reads 4.2 degree down on engine side, driveshaft 3.4 degree down, rear axle 0.3 degrees down (almost zero). Noise 99.5% gone with just me in car. I have my wife in car sometimes, but never loaded car down, like you said you did with kids and trunk loaded down. I am going to leave this in car for now, but you said you raised it up 3/8 inch up on trans vs what I did 1/4 inch. I can see the difference it made with my valve cover sloping down before, its now raised up with .25 inch shim. I might in future raise the trans up another 1/8 inch but for now, I will keep it where it is now. Randy thank you for this video, My gosh very happy to solve this long 9 year mystery. If you did not do this video, who knows where and what I would be pulling out. I have other things I want to do, and have been putting off til this is fixed. I am ready to press on..Thanks again
Thats great! Your angles are very similiar to what mine are! Im glad it helped you! Happy cruising!!! :)
What are your final readings? And did it fix your problems?
Great video. I have a stock 65 with a C4 and hot rod 65 with a T5. The hotrod has an extremely annoying driveline vibration at 60-70mph. The transmission tunnel and drivers seat shakes, but the steering wheel does not. I'm going to check the angles on my stock 65 and compare to the hot rod and report back.
Thanks for your informative video. Where on the rearend and transmission did you take the angle measurement?
I have 1965 mustang. Chasing down issues. The shop that set my 8.8 explorer rear, set it to 9 degrees down with weight on wheels. These idiots must not have checked my 8 inch. I told them to set it exactly like the 8 inch. I now have 10 degrees of wedge coming. Raised the T5 up with shims to about 3.2 degrees down. I will try to update later. Tired of working on this vibration issue.
Most cars are 3 degrees down with the engine/trans alignment. Snout will roll up with power application. If Caltracs bout 1-2 down with 3 degrees down at tail of trans. Cal's roll about 3 degrees up. Factory leaf springs will rise more.
Talk too much. Get to the point.
Great way to explained 👏 do you have Instagram
I'd like to show u the angle I'm getting in my 50s car