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Old 09-03-2011, 11:47 AM   #1
 
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Default Rear end vibration at high speeds

Well I've had the new rear in for a while but I've just been driving it around nothing crazy. Finally got on it and ran it up over 100 and it gets really loud and vibrates all the way up the driveshaft it feels like.

I know it's not the DS because I just put a new PST on a while ago.

The rear was just re-built. New 2011 Strange housing. New Detroit locker. New ring and pinion and all new bearings. The only thing re-used were the axles. Which leads me to believe that it was set up wrong.

I hate to think like that so I'm trying to rule out other things before I just have it re-built. Could the pinion angle make it vibrate bad?
And another thing, I have a new 1350 yoke to have put on the rear because I was an idiot when I first got the rear in the car it had a 1350 yoke with the tabs on the sides and I had a stock DS with stock u-joints. Instead of thinking about it I was an idiot and cut the tabs off so the u-joints would fit. Hoping when I did that that I didn't tighten the u-joint in the yoke off center and mess up the pinion bearing. Could that be it?

Just looking for some advice as to what it might be. I'm no expert on rear ends.
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Old 09-03-2011, 12:22 PM   #2
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Old 09-03-2011, 02:00 PM   #3
 
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Yep your 100% correct it is the drive shaft. The same EXACT thing happened to me a few years ago. I took it in under warranty and it was replaced free of charge, thank god.

After the new one was installed it made a big difference.

An old hot rodder once told me to spray paint a perfectly straight line down the length of the drive shaft. He said if the line ever starts to twist then it's easy to see.

I did not take his advice but I never forgot it.
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Old 09-03-2011, 11:32 PM   #4
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thread title sounds dirty.
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Old 09-04-2011, 06:14 AM   #5
 
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I have an Strange S60 that is noisy and does give some vibration. It actually whines pretty good. I have talked with strange and they tell me for this car (f-body) it is normal and not much can be done. They could change gears but it may be the same after that so I have left it. Do you feel the vibration in the seat? Also, I believe pinion angle could do it is it was far off, for yours I believe it should be at -2.
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Old 09-05-2011, 03:40 PM   #6
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pinion angle will cause a vibration due to ujoint opperating angle. some whining from a diff set up for racing is normal because it will whine when the ring gear is set closer to the pinion to prevent cracking
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Old 09-05-2011, 03:45 PM   #7
 
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Yeah, gonna have it looked at this week. From what I can tell the gears are just loud being richmond. Gonna have the new yoke put on and make sure the pinion angle is right.
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Old 09-05-2011, 07:29 PM   #8
 
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It is easy to check angle yourself with a $10 tool if you can get under the car. That is the issue I have. If you cant, you have to use ramps all the way around.
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Old 09-07-2011, 01:10 PM   #9
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Quote:
Originally Posted by Shibby50 View Post
Well I've had the new rear in for a while but I've just been driving it around nothing crazy. Finally got on it and ran it up over 100 and it gets really loud and vibrates all the way up the driveshaft it feels like.

I know it's not the DS because I just put a new PST on a while ago.

The rear was just re-built. New 2011 Strange housing. New Detroit locker. New ring and pinion and all new bearings. The only thing re-used were the axles. Which leads me to believe that it was set up wrong.

I hate to think like that so I'm trying to rule out other things before I just have it re-built. Could the pinion angle make it vibrate bad?
And another thing, I have a new 1350 yoke to have put on the rear because I was an idiot when I first got the rear in the car it had a 1350 yoke with the tabs on the sides and I had a stock DS with stock u-joints. Instead of thinking about it I was an idiot and cut the tabs off so the u-joints would fit. Hoping when I did that that I didn't tighten the u-joint in the yoke off center and mess up the pinion bearing. Could that be it?

Just looking for some advice as to what it might be. I'm no expert on rear ends.


Fail!!! Drive shaft and the pinion angle ftw.... u made the offroading f-body stock height drop down to supercar height....
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Old 09-07-2011, 02:00 PM   #10
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I second the pinion angle on the torque arm. Worth checking with an angle finder for sure
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