Dodge Cummins Diesel Forum - View Single Post - Thermal bypass
Thread: Thermal bypass
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post #14 of (permalink) Old 06-18-2019, 02:36 PM
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That thermostat is there to get the transmission and fluid hotter so there is less drag from thick fluid. I took the thermostat cartridge out of mine and made a plug to drive into the center of the block so that flow is always to the cooler and my trans ran 20 Cooler. I’ll take a cooler transmission over hotter any day. I’ve known a lot of transmission builders who told me they never heard of overcooling an automatic. Do a search on automatic transmissions and heat and you’ll see how as heat goes up life of the transmission goes down. My truck came with the max tow welded plate exchanger which is basically another fluid heater because it supposedly cools the fluid with engine water. I did away with that exchanger and replaced it with a fan powered remote Derale cooler and now my transmission runs 150 towing. Craig

2012 CCLB 4wd dually, 3.73, 68rfe, Fass. DD and towing machine.
Olde too soon... Schmart too late!
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