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Tranny Bump

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Old 07-15-2009, 06:37 PM
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07 Monte w/ 8500 miles When driving around 25 -35 MPH and I punch it I get a very hard thump It feels like the tranny......Thoughts??
Old 07-15-2009, 06:42 PM
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My guess would be either a transmission or engine mount is bad. Do you have an aftermarket downpipe? If so, this could be hitting the sway bar. Hope this helps.

-Mike
Old 07-15-2009, 06:51 PM
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no down pipe and she still kicks *** in the other gears on the hiway
Old 07-15-2009, 07:00 PM
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Is it still under warranty? If so, bring it in to the dealer. My guesses are engine or trans. mount and maybe a bad axle or cv joint. I am sure it is probably one of those.

-Mike
Old 07-16-2009, 05:17 PM
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its just the downshift it shifts hard sometimes happens to me too
Old 07-17-2009, 02:33 PM
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NewYork Art,
My '07 SS with 18,000 miles has the same driveline lash you describe; it's symptomatic of the loose converter and TCM calibration. I am still playing with HPT to try and get the goldarned tranny to behave like I want it to!




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