i am having a bad vibration when i deaccleration i cant find where it is coming from.. the car does have a th400 in it and a the drive shaft has a new u joint in the rear i havent changed the front yet. when the car is in park i can rev it and feel a vibration also i dont know where else to look maybe some of u guys can give me some hints on what to look for

 

Check your transmission mount, the fact that the car does it in park helps trace where it is coming from, because the rear end is not turning or the driveshaft. Check the mount, and also check your torque converter bolts.

 

it really just started doing this when i put it on the dyno.... it vibrates like hell when u let off the gas pedal got me stumped

 

Could be exhaust touching somewhere or trans or motor mounts. Converter could be another. Also check oil level in car. If its overfilled it will vibrate too. Just some things to check.