Spicer Single Drive Axles Service Manual: S170, S190, S590 - Manual (Page 40)

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Wheel Differential
9. Measure the ring gear total radial runout. Indicator
reading should not exceed 0.010" (0.25 mm).
10. Measure the ring gear total backface runout.
Indicator reading should not exceed 0.010"
(0.25 mm).
11. Check the ring gear tooth pattern. Paint 5 or 6 ring
gear teeth 180 degrees apart on the ring gear.
12. With the carrier mounted in a head stand, roll the
carrier on its side.
6. Install the carrier differential bearing caps and cap-
screws. Make certain there is no gap between the
carrier cap and the carrier surface.
7. Use an impact gun to snug all carrier
cap fasteners.
8. Recheck the backlash. For new gearing, the backlash
should be between 0.008" and 0.018" (0.20 and 0.46
mm).
Note: For used gearing, the backlash should be reset to what
it was at the time of disassembly.
Note: If you have too much backlash, move the ring gear
closer to the pinion. Count the number of notches you
back off the plain half threaded cup. Each notch equals
about 0.003" (0.08 mm) of backlash.
In order to maintain the differential bearing preload, you
will need to turn the flange half threaded cup the same
amount in the same direction. If you need more backlash,
reverse the procedure.
IMPORTANT