Spicer Single Drive Axles Service Manual: S170, S190, S590 - Manual (Page 41)

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Wheel Differential
13. Make a sling out of a strap and position around the
plain half of the wheel differential.
14. Connect the end of the strap to a hoist and apply
pressure to the sling.
15. Use the correct socket and a breaker bar to rotate the
differential. The differential should be hard to turn.
Rotate the pinion until the ring gear rotates 3 or 4
times in both directions.
Wheel Differential