I have a performabuilt level 3 tranny with a Yank 3k stall and I am running speed density with EFI Live's COS3. My problem is that the tranny shifts extremely hard under light throttle conditions. WOT shifts and medium shifts are perfect but cruising through a parking lot and it will snap my neck. Any thoughts?

 

did you disable the MAF code not to max line pressure?

 

Did it shift like this before it broke, or is this new with this tranny? You can try putting in longer shift times in the low tps settings

 

Yes sir.