here's the link to varnish build up at 220 F idea in the forum thread
here's the generic trans fluid temp chart attached
Transmission Temps - how hot is too hot?
My Setup: 2015 Suburban LTZ 4x4 5.3L with 3.08 gears standard trailering equipment (from factory) dos NOT include the factory integrated brake controller I added a Tekonsha P3 brake controller I am pulling a (new to me) travel trailer that has a dry weight of 5091 lbs I also have a weight Distrib...
www.gm-trucks.com
here's the generic trans fluid temp chart attached