7. Tighten bearing adjusting nuts to adjust bearings to
zero end play (Fig. 125). This condition may be
checked with screwdriver as shown (Fig. 126). All
bearing rollers must rotate as ring gear rotates, but it
should not be possible to move bearing rollers
sideways in cage when prying against them with
9. Check ring and pinion gear for proper tooth contact.
Paint ring gear with a mixture of red lead and linseed
oil (Fig. 128). When ring and pinion gears are
rotated, the red lead is squeezed away by the contact
of the teeth, leaving bare areas the exact size, shape
and location of the contacts. As a rule, painting about
10 or 12 teeth is sufficient for checking purposes.
Sharper impressions may be obtained by applying a
small amount of resistance to the ring gear with a flat
steel bar and using a wrench to rotate the pinion.
Gears should be rotated, under slight load, until ring
gear has turned at least one revolution in both
8. Use a dial indicator to check backlash between ring
Check tooth contact pattern on drive side (convex
gear and pinion shaft gear. Backlash is adjusted by
side) of ring gear teeth. Coast side will automatically
moving ring gear toward or away from pinion shaft
correct when drive side pattern is correct. Refer to
gear as shown in Fig. 127. Move ring gear by
gear tooth contact chart (Fig. 129). If proper tooth
loosening one adjusting nut and tightening opposite
contact pattern is not as shown, readjust backlash or
lock nut. When loosening one lock nut and tightening
add to or subtract from shim pack between bearing
opposite, move each lock nut same distance so that
cage flange and differential housing. Addition of or
bearing adjustment made in previous paragraph is not
subtraction of shims should be made in small
disturbed. Adjust position until gear backlash is
increments until proper contact is established. Split
between .010" and .014" if new gear set is used, or
shims are provided to permit removal or insertion
adjust to backlash noted at disassembly for old gears.
between bearing cage and differential housing.