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The recommended torque for the rear axle nut of a Chevy 3500 dually is 120 lb-ft and should be replaced when necessary. It's important to replace your tires every 30,000 to 50,000 miles to avoid accidents on the road. Ensuring your tires are in good condition is crucial for safety to prevent accidents. At some point, you may encounter issues with this component such as feathering or cupping problems leading to premature tire wear. The part may also loosen over time, so it's essential to inspect tire pressure monthly and check for any punctures if you run over sharp objects.
So, just to clarify, are you suggesting to tighten to 120 foot-pounds, back off to zero, and then tighten again to insert the key and retainer clip? Or are you unfamiliar with what an axle bolt is? I recall seeing a recommendation of 52 foot-pounds and back off to zero for a 2500 axle.
Around 120 pounds per foot appears to be the typical weight for this vehicle, although it may vary depending on any enhancements made.