Originally Posted by revspan
so...under normal operation, when you use this lockup system, you will only lock up in 4th gear?
BTW, thanks for the information.
If you have it wired up through a toggle switch like I do, it will lockup in 3rd speed also, maybe even 2nd. Not sure on that, but it will lockup in 3rd for sure. I have driven with the switch on and it does suffer on acceleration because of not having the torque converter letting the rpm come up, and it also shifts harder. The 5 pin relay has a wiring schematic of the internal wiring of the relay embossed on the side of it, so betwee the wiring diagram I attached and that, you can't go wrong with even a little electrical knowledge. The reason that you want the relay in there is so that the torque converter unlocks when you apply the brakes, even with the switch on. Big Al