2g gsx automatic rebuilds? or what

[TonySchmitt]

Hi new to this forum. Just got a 1995 gsx automatic. Someone put on a quick shift box and i think it is messing with my transmission. Started to slip all gears now and jumps in and out of gears. Would anyone have some input on this maybe i should just unhook from car and see? Just wanted to see if anything like this happened to anyone else.

 

[PlanZero]

Personally, I would just disconnect it and see. There's good chance your stock TCU may still be there. If not, they an be found for cheap.
Also, just for shits and giggles make sure your tps is working and calibrated properly. Every a/t issue I ever had was because of the tps, although those were stock trannies.