Around .005" -.010" measured at the crown wheel tooth
if you have back lash at the pinion yoke , that is not the backlash you need to measure as it is a combination of axle spline and side gear clearance in the diff
what is most important is the mesh position of the crown wheel and pinion teeth, preload on the pinion bearings and diff carrier bearings
you will need a workshop manual to get the correct mesh setting and preload readings
Testimonial: "Thanks Bill,Will pay attention to preload on pinion bearings and diff carrier bearings;replace shims with correct ones to bring back lash to within tolerance (according to specs)and rather prevent poss.excessive load/wear to crown and pinion gears."
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