Tom: I installed a trans-go shift kit and I am very satisfied with the performance. During the install, I noticed the valve body had a threaded plug opening where previous models had the pressure switch. I went to a local trans shop and they let me look through their stock of valve bodies. I found several switches each one having the mph lock-up number on them. I selected one that was a 32 mph lock-up. I installed it in the threaded hole I previously mentioned and removed the connections to the 2 gear pressure switch and attached them to the pressure switch I installed. The previous lockup speed was about 25 mph and now it is about 35 to 38 mph. At 25 mph, I felt this was lugging the engine. Now at 35 mph, no more lug....Hope this helps! Seems pressure switches are getting hard to find. The trans shop had only a new one that was a 54 mph switch. I felt this was a bit to high, but it would prevent lock-up until highway speed. To me, the ideal lock-up switch would be about 38, but I could not find one. Another good benefit of the added pressure switch is if the ECM lock-up functions fails, the trans will still lock. As I know it, the ECM provides a ground for lock-up, this function is now accomplished by the added pressure switch. Also, as I know it, when a programmed speed is reached, a sensor is tripped by the speedo mph and power is sent to the pressure switch and the ECM provides the ground, now the pressure switch will provide ground. I hope all this is understandable as I am just a plunker....
