Torque Converter Lockup switch?

[lords88]

I have heard that some people have made their own homemade version of a torque converter lockup switch? Is that possible, and if so how do you do it and what are the perks?

[dublniklz]

I have one. All you need to odo is "T" into the purple wire (i think purple) on the passenger's side of the tranny. Hook that T to a switched ground and you're in. It's is functional if you have an exhaust brake. I use it for that, it also keeps the truck from free wheeling at lower speeds/ or with the brakes on while coming down a grade. It's just something fun to play with, and it's easy to do.