Spicer Single Drive Axles Service Manual: S170, S190, S590 - Manual (Page 32)

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Wheel Differential
15. Measure the ring gear total radial runout. Indicator
reading should not exceed 0.010" (0.25 mm).
16. Measure the ring gear total backface runout.
Indicator reading should not exceed 0.010"
(0.25 mm).
17. Check the ring gear tooth pattern. Paint 5 or 6 ring
gear teeth 180 degrees apart on the ring gear.
18. With the carrier mounted in a head stand, roll the
carrier on its side.
19. Make a sling out of a strap and position around the
plain half of the wheel differential.
20. Connect the end of the strap to a hoist and apply
pressure to the sling.