4L60E lockup bypass?

[2500Ak]

Might throw a code. Would be a neat feature for rolling up hills and not lugging.

The newer transmissions use a new PWM valve that gives it partial lockup which might complicate things, but you can swap out for the pre-95 valve (so it's either locked or unlocked).

May also think it's slipping and enter full pressure mode or throw a code.

[kam2265]

The newer transmissions use a new PWM valve that gives it partial lockup which might complicate things, but you can swap out for the pre-95 valve (so it's either locked or unlocked).

I noticed that sometimes I get two levels of lockup, depending on how hard I push the gas going up a hill or under a load. I always wondered how that worked.

Cowboy, if you drive it with your foot instead of cruise and can push the gas pedal down a little the tranny will usually drop lockup on its own before grabbing third, at least thats how mine works. A bunch of my buddies with diesels have the manual lockup switches and i think it would be neat to have one too. They all have built sled puller transmissions though.