Knocking noise when in Drive [Archive] - GrandAmGT.com Forum

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MegaHyp
12-11-2004, 06:28 PM
i have had this noise since the end of summer. when my car is in drive and i stop, like at a light, i hear a knocking noise, but as soon as i put it in Nuetral or Reverse, it stops. any clue on whats going on with the tranny?? i have the V6 SE.

manic mechanic
12-12-2004, 07:56 AM
Sounds like it may be an exhaust rattle.

The drivetrain "flexes" when put into gear (in your case "drive" is the culprit) and a worn engine or exhaust mount (hanger) may cause the exhaust system to touch a metal chassis component and give you the effect you are hearing.

juanvan
12-13-2004, 11:14 PM
might be the GM Knock does it seem faster as you accelerate?

A wore mount would be more of a rattle then a knock since the metal is always moving...

Do you feel it in the floorboards newhere?