2002 4l60e horsepower?
Have the line pressure up decent high and the shifts tuned to shift fast. Been running it behind my car for 3 months with no issues. Im about to get 1 7/8 headers and 3.5" ypipe instead of my shitty eBay 1 5/8 headers and 2.5" ypipe lol should be a 10-20 hp gain over my current setup.. Just seeing if I'm getting to my max since I'm about to go fast 92.!
The automatic downshift from 3/4 to 1/2 causes the 3/4 pack to drag because there isn't enough time for the fluid to drain out of the 3/4 clutch pack apply piston and centrifugal force uses the remaining fluid to apply the clutch pack partially.
That is why these transmission burn up 3/4 so quickly. Much faster if you're hard on it.
There's a fix though, doing the drill mod to the input drum (complete rebuild), then upgrading the steels and clutches in at least the 3/4 drum from the 6 to 7 or 8 set up (might as well do all of the clutch packs while you're in there), on top of the shift kit. Add in a hardened sun shell, a 5 pinion gear set, and you're set to hold a LOT of power.
Horsepower ratings in transmissions and axles are a load of crap really. It's not just about max power, it's also about the traction and load on the other side of it.










