oldjohnt Posted August 21, 2015 Report Share Posted August 21, 2015 A while back I posted a question regarding auto tranny (GM 4L80E Auto OD) heating when driving in hilly country with way too many 3rd to 4 OD shifts taking place (just keep it in 3rd now if a lot of hills). Next question, in mountain country on long downgrades I shift my tranny down to 3 or 2 or even 1 for the good engine braking it provides DOES THAT HEAT UP THE TRANNY?? I really like it to save on brakes and wouldn't feel as comfortable without using it. I have since had it professionally power flushed and re filled with full synthetic fluid even though the old was neither burned or discolored or had any burned smell. It has an aux tranny cooler and I have room to add yet one more if needed and plan to add a temp gauge also. Thanks yall John T Link to comment Share on other sites More sharing options...
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