Originally Posted by skife
why not run both coolers?
from trans go to radiator cooler, then to cooler back to trans.
The tank on the radiator is mostly to help get the trans fluid to operating temp faster in cooler weather. Given most factory thermostats are between 180 - 210 for the cooling system, the temperature of the trans fluid after being run through the radiator will be in the range where transmission life begins to be affected. For heavy usage where trans temps regularly reach 200+ bypassing the radiator tank is preferred.
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