1972 rear vibration
Thread Starter
Instructor
Joined: Aug 2009
Posts: 129
Likes: 4
From: WY
1972 rear vibration
I have a 72 that has all 6 new U-Joints, wheels have been ballanced and it stil has a very uncomfortable vibration at 55 and up speeds, when I let of the gas the vibration is minimal or none at all. Any advise for me in curing this issue. Thanks
Le Mans Master
Joined: Jan 2000
Posts: 8,918
Likes: 27
From: New Hill NC
Make sure the camber alignment is not too negative.
Burning Brakes
Joined: Oct 2009
Posts: 1,066
Likes: 57
If the angles you describe don't cancel each other, what do you do, use shims of some sort?
Thanks
Safety Car
Joined: Oct 2005
Posts: 3,570
Likes: 1
From: Algonac Michigan
These things should be checked whenever the diff or trans is removed.
Shims can be used. I made a adjustable rear trans mount when I put in my T-5 5 speed and adjusted it to match the angle of the diff.
Look here http://forums.corvetteforum.com/c3-t...be-angled.html Or do a search on "drive train alignment"
Shims can be used. I made a adjustable rear trans mount when I put in my T-5 5 speed and adjusted it to match the angle of the diff.
Look here http://forums.corvetteforum.com/c3-t...be-angled.html Or do a search on "drive train alignment"
Le Mans Master
Joined: Jul 2006
Posts: 8,117
Likes: 104
From: charlotte north carolina
auto or 4 speed? is this a problem that is new with the joints? any other work done on the rear suspension? were the spring bolts reinstalled to the original length? if it's an auto, when the car coasts most of the stress is off the driveline and engine rpm drops. if is a 4 speed the engine rpm's remain the same(of course), and vibration could be engine related. if the vibration has developed since the u joints were installed, look there. check the angle of the half shafts. they should be only slightly angled upward going from the wheel to the diffy. much is said about the propeller shaft angle, but the half shafts are much shorter, and therfore the angles are more critical. you may want to install longer spring bolts to reduce the half shaft angle.
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