99 Purple XJ

I want to wire a switch to my TCU to make my torque converter lock at different speeds ive searched but what exactly will locking the torque converter do?

austinjoe13

It will cause the tranny input to turn the same RPMs as the engine. Like in a manual. But if you do this, only lock it at steady highway speeds.

The engine will turn about 300 RPMs less with the TC locked up. I myself would leave it be.

Big Chuck

Had to join just to ask.

If you don't know what it does, why do you want to do it?

ct67_72

you beat me to it. Thank you!

99 Purple XJ

I want to be able to lock it now on a switch cause im ordering a rock rail to fully manually control my tranny but was really meant to ask can i damage anything in the tranny

austinjoe13

Probably

cruiser54

Doesn't the Rock Rail allow you to do that?