25thhawk

iTrader: (3)

Cant seem to get rid of a vibration and noise that I have at light throttle and coasting. Also does it in neutral when coasting. Car is a 1998 camaro. With the chassis at 0, the trans output is -3, the driveshaft is 0 and the rear is 0. I have also tried drivehaft at -1 and pinion down 1 and 2. All three settings made the noise. Should I go positive with the pinion or move trans up a little, maybe -1 or -2.

Thanks

01ssreda4

iTrader: (96)

Can you shim the trans up to zero?

Jon@BruteSpeed

iTrader: (3)

I would go +1 or 2 with the pinion for an overall effective -1 or 2 total pinion angle. Pinion angle is the relation of rearend centerline to engine/trans centerline, angle to driveshaft on either end is not pinion angle. However, for a u-joint to operate efficiently, there should be a minimum of 1 deg of angle on either end (driveshaft angle to engine or rearend). You don't want the two at the exact same angle.

Also, have you checked your trans mount? A broken one does a good job of inducing vibration.

25thhawk

iTrader: (3)

I dont think I can get trans up to 0. It will prolly hit the tunnel. New trans and yoke and u joints. Driveshaft just rebalanced. Tried both a stock and poly trans mount. It sounds like the front u joint or yoke rattles around when not under load. It is not a continuous vibration. I can try going positive with the pinion, but was thinking that going less negative with the trans was a better idea. Thanks