If you don't know how to set up a diff, you will be money ahead to get a complete unit from a salvage yard. You can destroy $1000 worth of rear diff parts if they don't get set up correctly. The bearing pre load and pinion depth need to be right on. Very little room for error. Too loose and it will be noisy. Under heavy load you can have the same thing happen again. Bearings too tight, not enough gear backlash, and it will self destruct in a matter of a few minutes. LKQ salvage yards offer rebuilt rear axles for GM trucks, so they likely have one for yours. The next thing is stop using that tuner when you're hauling. The 7.3 may be able to handle it, but the rest of the drivetrain isn't up to twice the original power.
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Today's Featured Article - Listening to Your Tractor - by Curtis Von Fange. Years ago there was a TV show about a talking car. Unless you are from another planet, physically or otherwise, I don’t think our internal combustion buddies will talk and tell us their problems. But, on the other hand, there is a secret language that our mechanical companions readily do speak. It is an interesting form of communication that involves all the senses of the listener. In this series we are going to investigate and learn the basic rudimentary skills of understanding this lingo.
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