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Please read the other threads here, several very current on proper break in of the differential. 4000 lbs. is not close to a maximum load, but will definitely bring the ring gear and pinion gear mesh pattern into a deeper and much fuller contact. You risk gear breakage in my opinion unless you go through several heat up, cool down cycles, as many as you can and preferably enough to get you 500 miles of total towing.
I'd stay under 60 mph, if not 50 and stop every half hour and let it cool down for at least several heat up, cool down cycles, if you don't want to do the full 500 mile routine. Do as many as you can. You only have to do this for a total of 500 miles of towing and then you're good to go forever.
For people just pulling a small single axle trailer and maybe 1000-2000 lbs., I doubt there is any need to do anything but hook and go. But 4000 is enought to break it in right.
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'04 Armada SE Offroad 4x4
Big Tow Package
Galaxy Black
K&N Drop In Air Filter w/ airbox mod
Carbotech Bobcat front brake pads at 28K miles (no brake judder, just time to change pads)
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