Ok. so I recently picked up a 1999 camaro z28 auto trans. I'm trying to work some kinks out of the transmission.
1st. I have this vibration in the car the higher the RPM's the worse it gets I was thinking u-joints but not so sure because if I leave the car in park an rev it I get the same vibrations as if I'm driving it any ideas on what this could be?

I just wanna figure it out because it's annoying an well I'm sure it's not good for the transmission, also I plan on changing out the torque arm/trans. mount because I get this thud sound from under the center console an been told that it's more than likely that so I just wanna do all this at the same time.
Any help would be great full!!
Thanks Lance.

 

Go to an oil change shop and get underneath the car with a flashlight and inspect (2)engine and (1)transmission mounts. If they are cracked, collapsed, or rubber missing the time to change them.

 

Check your trans and engine mounts.

 

I'm gonna hafta say check the motor/trans mounts also