On a 12 bolt with limited slip, a new unit will have no axle end play, a worn plate type will have some end play, re-shimming the clutch pack will reduce it. The Ford 9" has a better axle bearing but still has brake knock back problems. The cheapest solution is to use a floating caliper on the rear. If you want to use a fixed caliper, you need to install full floater axles.
David
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