AxlCrucifix Posted August 12, 2008 Report Share Posted August 12, 2008 I have a 1989 Grand Prix with the 4 speed auto, and it is rough when it shifts into reverse. It makes a thud, and you can feel it when it does it Shifting into drive is fine, and sometimes the shift between 1st and 2nd, or 3nd and 3rd is a bit rough, cant remember which, but only rough when under moderate acceleration. I've got some new dogbones on it by the way. Any ideas? Quote Link to comment Share on other sites More sharing options...
Addicted To Boost Posted August 12, 2008 Report Share Posted August 12, 2008 Make sure the vacuum line is connected to the modulator on your transmission and not leaking. You may need to remove your airbox to see it. Quote Link to comment Share on other sites More sharing options...
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