Vibration from trans?

jwicker said

Hey all,

I have a vibration that sort of comes on and gets really bad at particular RPMs. It happens in neutral as well. Without a tach, I can't say quite what RPM, but it's easy to reproduce at 50MPH in 3rd gear. More gas makes it go away, less gas makes it go away.

I believe my motor mounts are totally shot, so I was planning on replacing those soon, and maybe even the trans rear mount.

Any thoughts on what to check?

Click to expand...

when you say it happens in neutral do you mean stopped in neutral and revving it or coasting in neutral and revving it?

have you gotten under it to check anything out besides the mounts? which you should do as a matter of course.

i'd take a WAG and say either something trans related or the harmonic dampener is coming apart.

years ago i had car in with a /6 that would shake like crazy at specific RPM and especially under load. it seemed perfectly fine at idle and wasn't bad driving per-se, just a little less than desirable in the smoothness department. turns out it had a bent rod.