The FAMOUS driving VIBRATIONS !!!!!!!!!!!!
The FAMOUS driving VIBRATIONS !!!!!!!!!!!! Ive seen all the posts on the driving vibrations, turning the drive shaft 180degrees, checking the u joints, changing the pinion angle. I guess what i want to know since i cant seem to get rid of it!? is it BAD to continue driving with ? i mean 70-100 it just vibrates and its like what the hell. ? do i have to find a way to fix this to be safe at the track and or street.
I know of at least one customer who installed the one inch longer driveshaft and had his vibrations go away. It certainly isn't consistent that every car that goes with a nine inch and uses the stock driveshaft will end up with a vibration, but if you do have a vibration this could be the reason. Bob
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Check all your wheels/tires and make sure they are balanced. Bring them to any tire place, they can check and balance them for probably $5 a piece.
Check your rear wheel bearings. If they have play in them (wheel moves up and down in axle shaft) you'll need to replace them with new ones.
Check your pinion bearings as well. If there is play in the pinion shaft, you'll need new pinion bearings.
Check your rear wheel bearings. If they have play in them (wheel moves up and down in axle shaft) you'll need to replace them with new ones.
Check your pinion bearings as well. If there is play in the pinion shaft, you'll need new pinion bearings.
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On The Tree
Joined: Jul 2007
Posts: 195
Likes: 0
From: Virginia
I've got a similar vibration and after getting a longer driveshaft it still vibrates. Although now that I think about it mine only vibrates badly when the car is coasting (50mph+) or decelerating (50mph+). I have yet to figure out what it is! Any ideas?
On The Tree
Joined: Jul 2007
Posts: 195
Likes: 0
From: Virginia
You know I'm not exactly sure about that. I know that I have a 3.5" steel driveshaft, but I haven't noticed any weights on it. I'll have to check that out asap.
Look at the yoke on the diff real close. Measure the thickness where each joint goes and measure to see if each side is EXACTLY the same distance frome center. I had installed new yokes on 2 different diffs in different years, 1 12 bolt and 1 Dana 60, and the yokes were the culprit. The 12 bolt yoke was off to one side .064". We tried everything. I was getting frustrated as my customer wanted his car. By chance I noticed the tips or ears where the joint was to be centered were not the same thickness. We measured and found the yoke defective, put a new one on and it worked. The Dana, 6 years later, was similar. The holes for the straps were off to one side just a little. Being new parts you'd think to look somewhere else. But it was overlooked for something more suspisious, like broken mounts, driveshaft/balance, pinion angle, etc... Hope this helps.
