Do I need an aux transmission cooler?

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GoToGuy

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What's your GCWR ? That's gross combined weight rating?
Combined is loaded truck and trailer? Trailer pitch is to low. Change from drop hitch ball, to level hitch ball, trailer tows level.
Towing over your weight rating is your choice.
Your operating at load capacity, therefore operate like your carrying a big load. Slower acceleration, longer stopping. Drive slower uphill, pulling gonna create more heat, don't push it beyond your wallet size.
It's very specific about pulling loads in D not over drive. That's for transmission longevity. 4L60E isn't built to tow in overdrive. Of course people do it, and a lot of people have poor judgement. Play smart, take it easy, enjoy, no breakdowns.
 
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