I would plug the internal and use the external.
Auto trannys make plenty of heat and the coler they run, the longer they will last.The use of the external cooler only will keep the heat from the tranny out of the radiator too.


There is enough good in the worst of us and enough bad in the best of us that it does not behoove any of us to criticize the rest of us.
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Be yourself. If you are ever lost, It will be much easier to find yourself if you know who you are!