I just installed a 4000stall and have 3.73s it basicly hits the rev limiter in every gear....

Its a stock internals car for now....

How low should I change the shift points to start? 400-500rpm undershift point?? anyone have any advice.

 

just have to play with it,I set my rpm where I want it and then raise the mph a little everutime, till it shift where I wanted it, make sure your gear change is in the tune also, what software are you using ?

 

HPtuners....

I have Khumos on the back I think its a combo of tire spin and a bad tune causing it to hit the limiter....

 

Anytime you put a big stall the mph is not right for the shifting, you have to change it in part and wot shifts, keep raising the mph till it shifts right, you can look at some bin files and maybe find someone with your mods and stall and get a good starting points for MPH ! Or send me a bin file and ILl look at it for ya !