Join Date: Jan 2015
Location: Injun Territory, 'Merica!
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If you drive the vehicle moderately with near stock size tires and wheels, would consider starting with replacing the wheel bearings, if they have not been replaced. Sealed axle bearings are a ticking time bomb, so any times, they seize and chew up the axles. If the original rear is behind a relatively stock drivetrain, the posi still hooks up, and the rear end grease has been changed several times over the course of the GTO's life, the rear may not need much. I can get much more detailed, if you need. Have found the limits of the gray iron Pontiac 8.2 rears, as well as the limits of other performance era rears.