Posted by jimg.allentown on August 09, 2020 at 12:40:11 from (70.15.42.177):
In Reply to: Hot GM Transmission posted by super99 on August 08, 2020 at 18:47:37:
Let me offer some explanation about transmission heat.
Where does it come from? Partly from the engine, which operates at around 235 degrees F. The majority of it comes from the oil turbulence in the torque converter. There is very little if any heat generated by the clutches, bands, or planetary gear sets. If the clutches were generating heat, they would burn up or burn out in short order.
Most all transmissions today have a TOT sensor - transmission oil temperature. This sensor tells the computer the temperature of the oil in the pan usually. If the oil starts to get too hot, the computer will lock up the torque converter to reduce heat buildup. This eliminates the heat being built up by the oil turbulence in the torque converter. At least that is how Fords are set up. I'm sure that the other carmakers have similar setups.
Towing in overdrive is generally not a good idea in hilly country or under high load conditions. As was already said, the torque converter will be frequently locking and unlocking resulting in more heat buildup.
Since the transmission is cooled by a coil in the radiator by the same coolant that is cooling the engine, an auxiliary cooler AFTER the cooler in the radiator is always a good idea. It will extend the life of the transmission.
After having been rebuilding transmissions for over 30 years, I never once saw clutch linings come unbounded. I have seen plenty of them burned out or showing signs of overheating and slipping, but never saw the linings come unbounded. Same with bands. I have even seen torque converters turned blue from overheating or slipping.
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