Re: 12 Bolt Rebuild
Why a rebuild? Jack up one wheel of rear axle, leave trans in neutral.
Apply torque wrench onto a lug nut and rotate the one tire with opposite tire on the ground.
You are testing the tightness of the clutches. Torque to 'break loose' the clutches is a minimum of 35 ft-lbs.
If the axle passes this test, just change oil and add GM clutch additive.
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