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still chasing high speed shifter car vibration buzz over 70. It is like a cheap massage chair at 90 and noisy...
pretty much rehabbed / replaced balanced everything but driveshaft ..
only in 4th high speed, all other no issues..
I am calling around to driveshaft places to see if they will balance..
as far as i know i aligned the driveshaft and yokes as they were removed.. and when replacing u joints etc.. marked. the car always buzzed at high speed since i got it. even rebuilt transmission (bad input bearing at neutral clutch out)
Questions
- has anyone sent theirs out? what was reason/ result?
- do you bring them the driveshaft with all u joints and transmission yoke? they will balance with all?
- will i screw something up or is this another rabbit hole?
thanks!!!
took to Indy axle and drivetrain.
got a call and they said the yoke is a problem, it has a spot on it as it goes into transmission that will cause a vibration. Offered a yoke but would need to adapt to a smaller u joint????
i said can i buy the right one and they will use they said ok..
not sure what is wrong with it but hoping my issue..
ONLY ZIP had the part..i called many https://www.zip-corvette.com/68-81-d...slip-yoke.html
So now you have to wonder about that bearing sleeve in the tranny tail-shaft housing also.
It might be oblong after yrs of beating on.
luckily.. not that old.. rebuilt new bushings/ sleeve and seals and bearings..about a year ago..and maybe 4000 miles.. so glad i took it in. no leaks from seals so far.. i honestly do not know about sleeve wear? https://www.corvetteforum.com/forums...r-etc-diy.html
Last edited by interpon; Apr 26, 2022 at 04:38 PM.
Almost related-I had a high speed driveline vibration in my 69 Z/28 from the day I bought it. I tried everything to no avail until, after years of living with it, I was changing the rear gear ratio and found the input shaft bearing was super loose. Problem solved,
Almost related-I had a high speed driveline vibration in my 69 Z/28 from the day I bought it. I tried everything to no avail until, after years of living with it, I was changing the rear gear ratio and found the input shaft bearing was super loose. Problem solved,
mine was bad too. It was the reason I rebuilt it. No such luck on vibration though.
Certainly frustrating reading every thread last 20 years with mixed results, so hoping to nail this.
I chased a slight vibration at speed and ended up having to pull the driveshaft and have it re-balanced at a semi-local shop. lucky enough that was the problem (good thing as it was basically the only thing left at that point.
M
"Only on 4th" ??? Seems like it might be related to the transmission more than the driveshaft. 4th is the only forward gearset that the load is straight thru the tranny from the input to the output, while the counter gear is freewheeling. Yoke is rotating faster with road speed but if the yoke is the issue, you should be able to feel it in 3rd (assuming you can do 70 in third?)
I have experienced front driveshaft imbalance on my blown 2010 Camaro SS and it absolutely does make the shifter buzz. Sheared off several front and rear driveshaft bolts over the years. Front bolt toss shakes the shifter, rear bolt toss shakes the back of the car.
You've probably already checked this: When the trans. is in neutral with the wheels blocked to keep the car from rolling...
how much does the diff. pinion shaft rotate from left to right & right to left?
Also recheck the tail bushing for wear while the car is blocked and in neutral....
the yoke should move only a few thousands of an inch up & down/left & right.
thanks all.
i have not done over 70 in third..LOL not sure i would know with the engine spinning that fast with 3.70 gears..i do know that it had a vibration since i got it even after
- tranny rebuild, only needed seals and bearings
- all u joints
- bushings
-mounts tranny and engine and several types
- trailing arm bushings
- multiple alignments/ tire balancing
@doorgunner good point , it is out of car and waiting for parts.. BUT i did notice prior to removal and inspection.. the yoke at the tranny i could move up and down i thought excessively, not sure i remember that..(the shaft inside transmission has slight movement and was told normal) the bushing sleeve visually looks good but that is visual inspection comparing to new as i just changed it a year ago.
I do not know how driveshafts are balanced but my guess is they have a dummy shaft and they found an issue so i am assuming my tail shaft is OK and sleeve. I will hope and assume the yoke as they say...has a bad spot that will cause vibration at tranny end.
i will try and get old parts and compare to new USA made zip part.
cmon Zip!! hoping to get it running this weekend!
From: Some days your the dog and some days your the hydrant.
Royal Canadian Navy
I had a bad stock shifter buzz at ~3500-3700 rpm. Stock shifter is mounted on the frame. Put in a Hurst shifter for an upgrade which mounts to transmission. No more buzz.
When they did mine I just marked the yoke / shaft orientation with a set of dimples and a paint stripe. They ended up with the new weights about 45 degrees off of where the factory ones were on one end and a bit more on the other. Took them less time to do it than it took me to find the shop in the small town they are in.
M
When they did mine I just marked the yoke / shaft orientation with a set of dimples and a paint stripe. They ended up with the new weights about 45 degrees off of where the factory ones were on one end and a bit more on the other. Took them less time to do it than it took me to find the shop in the small town they are in.
M
ups 315 from zip my new usa made yoke, 30 minute to shop as they held my driveshaft all week,
430 done.
i verified he said again it would vibrate at high speed with the old yoke..new no issues in his machine i assume because he balancd it. 95 bucks from day one and 95 when i left..and a tip.
weights noted in pics, added one across from factory square and moved the original round slightly.
measured outside shaft new and old..identical. I really cannot visually see anything.
seems tighter and driveshaft does move but mich less when lifting.
i totally misplaced my straps for differential end..i hope they are same front and back! Zip came with straps and bolts and so did the balance shop. I must have lost a set!
test drive time 😝
Pleased to report success.
smoother at all speeds..rearview mirror headlights start to distort at 95 bit still zero vibration on car or seat. That damn shifter still rattles but a finger holding down stops it which I couldn’t do before.
highly recommend this place if indy or looks like sameday mail.
i guess if you change u joints or cannot remember if driveshaft balanced , a worthwhile effort. https://inrackandaxle.com/
Last edited by interpon; Apr 30, 2022 at 09:38 AM.
driveshaft balancing schooling please
