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 - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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