What I'm getting at is the forces and heat generated in the drivetrain with 285/260 at 12800 GCVW is WAY different than 12,800 with 260/442 or 470/470. The speeds that can be achieved/sustained by higher hp/tq will surely generate more heat and load?Yea but the gas Gladiators and Wranglers with the D44 are rated for the full 7,7xx towing capacity. Correct?
I have yet to get under the Ecodiesel models, but are the drivelines the same? If so, this could be the reason they derated the tq for the Jeeps? The pickup also gets the 9.25 diff which has a larger ring gear and holds more oil than the D44. The pinion 9.25s eat bearings but they seldom come in broken.
Engine and trans heat can be dealt with, but how do you get the heat out of a differential or transfer case?
The engineers have to take the worst possible scenario and factor that into the warranty/failure equation. Many people on the east coast have no idea the brutal conditions we operate under here on the west coast regarding heat and road grades due to elevation change. Think Towne Pass in Death Valley at 130° ambient!