When my T/A gets up to about 95 and above i get a vibration and nosie that starts to come from the rear protion of the car. like transmission back. I was thinking it could be one of the little weights on the drive shaft. but i dont know, anyone ever had this problem?

 

If you still have the stock steel driveshaft it's very likely the problem. You could try having the ds balanced but odds are it may still vibrate. The only real fix is to upgrade to an aluminum LS1 ds or a better balanced aftermarket shaft.

 

where can i go to get the balance or where could i get an ls1 driveshaft for a decent price? Thanks

 

I had very similar issues. LCA relocators solved the problem. This was after many shots in the dark, including new rims, TA, stabilizers, tranny mounts, gears, and tranny. Good luck with yours...

john