trans vibration

[onpoint357]

I recently rebuilt my 94 lt1 in my formula firebird. I had a garage re install the motor. The said they had to drop the trans to get the motor in. Now I get a bad vibration when its put in gear, it is really noticable when i put it in reverse. I don't really notice it when i drive. but i've only put about 26 miles on the motor since rebuild. can the garage have bent the fly wheel or overfilled the trans. any suggestions? (4l60e)

[Chris 96 WS6]

This is a manual transmission car, right?

[onpoint357]

Sorry , yes 4l60e

[Chris 96 WS6]

4L60E is an automatic transmission. Moving this to the Auto trans forum.

[performabuilt.com]

It is unlikley the vibration is transmission related and since as i understand you have it setting still and in reverse, most likley you have a broken or damaged mount or something metal ,lines ect contacting the body where vibrations are normally isolated by the mounts , Have them look for one of these things and im sure you will find your problem
thanks
performabuilt

[onpoint357]

Thanks, if it ever stops raining I will check It out.