I have a 94 Z with an A4. Its had the driveshaft replaced about 6 yrs ago with a 1LE aluminum shaft due to the steel one vibrating really bad.

Well, over the last year I have been noticing a vibration coming up through my center console. It strarts at around 85mph, and gets worse as speed increases. Its driving me crazy now that I commute down the interstate everyday.

The tranny mount is in good shape. Its an LS1 tranny mount.

I already tried the turn take it off and turn it 180 degrees thing.

Could this be a u-joint problem? Does my driveshaft need rebalancing maybe?

I called a driveline place, and they wanted $100 to replace the u-joints and balance the driveshaft. Is that a fair price?

Thanks for any help.

 

does it happen if you are not in OD? if it still happens at the same speed than it's probably driveshaft related...i'd say $100 is reasonable, if for nothing else preventative maintainence for the drive line.

if it happens earlier in a lower gear ti could be a mout someplace else...ie...rpm related not speed

 

replace the u-joints yourself. If it still does it, have it balanced.

I bet the joints fix it.

 

If it doesn't do it in overdrive, then would you say the torque converter is off balance then?

I'll replace the u-joints myself. They probably need it anyways. i've had quiet a few launches with this shaft.

 

i have the same problem with my a4, i put in a energy mount and then it started doing it only till about 2K in any gear, but in OD its horrible that guy said it is because the TQ Converter isnt balanced?

 

My guess would be that you threw a weight off the driveshaft and is now un balanced causing the vibation. Couldn't hurt to replace the u joints as well.