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 - Old Abe is Still Making Hay - by Jeremy Sweeten. Things have changed a bit since my last article. I am now almost finished graduate school at Purdue University. I am still in Agronomy, but specializing in hay and forages. My wife has survived two years of marriage to a part-time farmer. The equipment line up has changed a bit too. The DC has retired to
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