According to GM the life of the fluid is 100k miles under normal driving, 50k for severe service. Obviously I overshot it by about 10k miles. The tcase is the same as well.
The differentials are a "fill for life" aka 100k miles so when they grenade on you it's out of warranty, those will be done this week.
And after having it in there a few days the truck seems to shift smoother.
And JSDirt, these new trucks have a built in trans thermostat which fully opens around 192 or so, and I've never had it over 220 to my knowledge, I always keep it on the trans temp readout while towing
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