In the upshift table "Base Shift Pressure vs. Torque vs. Gear" what are safe pressure limits for a stock 4L80E at the various torque settings?
I've got 1->2 and 2->3 scaled from 0 @ 40lb-ft to 84 @ 640lb-ft and those shifts are really nice for my stock truck.
I've got 3->4 scaled from 12 @ 0ft-lbs to 90 @ 520ft-lbs and it's still too soft. How far can I go with pressure on this one?
If I'm approaching maxing out safe pressure, I'll have to go in and enlarge the 4th feed hole. I remember it being really small like .050".
Stock 2005 2500HD 6.0/4L80E 35k miles.
Thanks!