85LT1Z28MEX

The car jumps really bad when going 1st to 2nd gear, but shifting manually don't. I re-programmed PCM with new wheels & tires size but still jumps.. is this the tranny ???

need help

S.J.S.

Does it do it all the time???? Mine used to do that but only after like a long drive.

85LT1Z28MEX

Only at WOT,

S.J.S.

How long have you had the car? Does it have a shift kit in it? Most shift kits are designed to shift hard at WOT.

85LT1Z28MEX

BRYAN programmed my PCM to shift hard. so it's supposed to do this jumpin' , or I have a traction problem?

85LT1Z28MEX

Ok.. It´s not a hit from a firmer shift.. What I meant is that when the car shift from 1st to 2nd.. start bouncing on the rear.. so I have to let the Gas pedal and then step on it again to stop the bouncing..


thanks..

S.J.S.

"bouncing"???? What ? Do you mean wheel hop? Are you like WOT? If so then I would say you just have suspension problems and need to get some LCA's and relocal brackets.

Joe Bellman

If the back wheels are hopping check what S.J.S. said. Are the shocks original in the back, that could be contributing to the problem. If your tranny mount is broke, that will make the car feel like it is jumping up when the transmission slams into the bottom of the car.