Depending on what rear axle you have, semi floating or full floating, you probably should take a look at what the rear hub and differential temperatures are running.
Especially if it is a semi floating axle, the moving of the wheels outboard like duals do can put more stress and generate more heat in the wheel bearings.
A cheap infrared temperature gun, even from Harbor Freight will work well enough to get the hub temps and differential cover temp so you can see where you are at. Take the temps after a decent length highway run in warm weather.
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