Exhaust close to trans pan = Xtra heat ?

[Grumpy Bear]

7 minutes ago, boettcher40 said:

Maybe I've been thinking this wrong since I did the thermostat mod (I didn't "flip" the pill, I used the 1/4" NPT tap with a brass plug method) 

 

To my recollection, the point of the thermostat is when the fluid temp hits the designated temp (180F?) the cooler bypass (tstat) opens up and starts to cool the transmission.. If there is no thermostat, it recirculates fluid at all times causing it to heat up slower? I always thought too cold is just as bad as too hot since the fluid is less viscous.. Like I said, maybe I'm overthinking it and am by no means an expert when it comes to transmissions!

 

I find it pretty funny, on my dads AT4 w/ the 6.2/10spd, hauling a 7x14 all aluminum trailer with 2k lbs in it on the interstate, it runs no warmer than 160F. Wonder what they did in the new 10 speeds that allows for a much cooler temp.. factory trans cooler, different thermostat, etc.

 

This is what intuition would tell you, right? Consider this. The fluid is recirculating in a bath of....???? Hot water!! How hot? About 20 degrees cooler than the water thermostat if it is in the cold tank like the 4.3 or about 15 cooler in the V8's whose cooler is in the hot tank. 

 

Point being that until the transmission fluid is hotter than the engine coolant this cooler is actually a heater. The factory thermostat does not have a minimum flow bypass to the cooler so in the factory configuration all heat being driven into the fluid is from working the fluid. 

 

I have no idea what the set up is on your fathers truck. Sorry.