I have a 4L60E. When I take off slowly there is no problems, but if I get on it even a little there is a clunking noise under the middle of the car. Also if I floor it after I get going and it shifts to 2nd or 3rd gear the clunking noise comes as it shifts. I can feel it doing this too. Any thoughts on the problem? Please tell me its not too serious!

 

Check your trans mount,bet its broke.Pretty easy and cheap to fix($20.00 part).Remove the bolts,jack up the trans,replace.

 

i concur ... its the tranny mount

 

Tranny mount. Happened 29 days after buying my '93.

It's not too bad... hopefully your rear seal on your intake isn't leaking like it is on mine, then your fingers won't even get too dirty.

 

Tranny mount, happened to me within a month of buying mine.

First time was in heavy traffic and thought the guy behind me had barely touched me or something! Got out to kill him