Spicer Tandem Drive Axles Service Manual D170, D190, and D590 Series - Manual (Page 34)

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Drive Pinion
5. For Forward Carriers Only: Install the helical with
the larger boss side facing down in the carrier. Align
the helical gear between the inner and outer bearing
cups.
6. Place the pinion on a 6 x 6 x 6 block of wood and
lower the carrier over the pinion.
7. To align the splines of the helical gear to the
pinion, use a old pinion nut with a metal ring welded
to the top, thread onto the pinion. Then lift the pinion
while aligning the two splined surfaces.
8. Install the pinion spacer.
Note: If you are using the same drive pinion, use the same
spacer that was originally installed in the assembly. If
the drive pinion is to be replaced, the original spacer will
be used as the starting point of adjustment.
1 - Large - Long Boss
1