I have done a little bit of research on stock equipped 4l60E's and it seems they have pressure and shifting problems.

Well I looked up servo upgrades and read reviews on how the kits sold solved the shifting and surging/pressure issues.

So my question is if any of you guys know much about the aftermarket servo kits?

I have what seems to be a rather common problem dealing with quick shifting from 1-2 and surging or (sudden drops and increases in line pressure) Any info or input may help.

 

I'd call up Dana at Pro Built and see what he recommends as a fix.