Horrible Vibration! Need Help!

[acesmike]

When im driving Im getting quite a bit of vibration on the shifter, and the faster I drive the worst it gets. At freeway speeds if I put it in nuetral the whole car vibrated and you can hear a violent buzzing. I just replaced the u-joints on the driveshaft (steel 1 piece) and pulled the rear end out and found everything in good shape and tight, and I got my tires rebalanced. I have a 2001 3.8 and have changed over to 4.10's and an aburn limited slip, with no problems for the last 2000 miles since the swap. Im limited to diving at the very most 65 mph as the vibration feels like my car will snap from underneath. Could my tranny need servicing, it rattles in second gear, so maybe something internal is wrong? Thanks for taking a look to help.

[FirebirdGT]

Re: Horrible Vibration! Need Help!

Have you looked at the transmission mount?

[acesmike]

Re: Horrible Vibration! Need Help!

I took your advice and tossed a new one in, the rubber on the old one was cracked and worn. Still the same old problem though. I purchased some rear axle bearings, maybe that could fix it?