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Old 05-14-2015, 11:38 AM   #11
Senior Member
Join Date: Feb 2013
Location: WI
Posts: 237
I know my 14 Silverado runs around 190 with factory cooler while towing which they say is acceptable. I just added a PML deep tranny pan on mine which adds cooling fins and 2 quarts fluid. Plus it has a drain plug now and I can just drain and fill factory fluid more often. The new GM trucks from what I understand actually have built in thermostats that don't even open till higher temps which may make add on coolers more difficult.

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