I put two trans coolers on the last three yank wagons I have run.
That's towing 3.5 ton from minus 25 ish up to 30 deg up mountain roads.
I replace the hard lines with braided lines and simply add another cooler on the front of the radiator.
In total I have towed nearly a million km in total using that set up.I change utes at 300k and have never had a single transmission problem.I change the oil and filter yearly.
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