I had my tranny rebuilt last fall in late Sept., my heat exchanger (on the side of the block) wasn't leaking, but it was really crusty, so I had the tranny shop eliminate it (cost prohibitive through the dealer to replace) and I went with a large cooler from O'Reilly's that was bolted to my bumper ... I went with a deep sump pan from LPW Racing Products-phone # 717-394-7432, I used a GlowShift temp gauge and the sensor is in the pan, I drove the truck up until Dec. when the ECM went out, I only towed a light load with it in that time frame, and the temp never went above 150, other then that, the temp would only climb above the base temp of 100 when I was idling, or in city traffic ... I'm now waiting on my ECM to come back from Auto Computer Specialist, and I'm going to re-route my grounds/B+ while I wait ..... When I was searching for a deep sump pan I found that LPW had pans that were built like the Maghytec's, but priced like the Derale's, and you could buy it with/without the pan being pre-drilled for a temp sensor (at the time a $10. option for pre-drilled) ...