Chevrolet 70 1969 Series, Shop Manual

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REAR AXLE 4-50
Figure 2 4 — In sta llin g Sp a c e r in Idler G e a r
Figure 2 5 — In sta llin g Idler G e a r S h a ft in A d a p t e r C a se
DIFFERENTIAL BEARING
PRE-LOAD ADJUSTMENT
1. Using dial indicator at back face of drive gear as
shown in Figure 23, loosen bearing adjusting nut on
flanged side until end play can be noticed on indica­
tor.
2. Tighten the sam e adjusting nut until 0.000 inches end
play is obtained.
3. C heck drive gear run-out. If run-out exceeds limits
listed in “ Specifications” remove differential assembly
and check for cause.
4. Tighten each adjusting nut one notch from 0.000
inches end play position, to place correct pre-load on
differential bearings.
NOTE: After bearing pre-load has been adjust­
ed proceed with tooth contact and backlash ad­
justment before completing the next step.
5. Install adjusting ring locks and secure with cap
screws. Install lock wires at locks and bearing caps.
GEAR TOOTH CONTACT
ADJUSTMENT AND BACKLASH
Drive pinion is adjusted for tooth contact by m eans of
shims between pinion cage and carrier. Drive gear is ad ­
justed with right and left adjusting rings at sides of differ­
ential. Refer to “ G ear Tooth C o n tact and B acklash” in
“ G E N E R A L R E A R A X L E I N F O R M A T I O N ” section
for tooth contact and backlash adjustm ent instructions.
Backlash dim ensions are listed in “ Specifications” at end
of this section.
THRUST BLOCK INSTALLATION
1. Position differential carrier on side with back face of
bevel gear upward.
2. Place thrust block on drive gear; then rotate gear
until hole in block is aligned with adjusting screw hole
in differential carrier.
3. Install adjusting screw and lock nut; then tighten
screw until thrust block seats against back face of
gear.
4. To obtain correct clearance between block and gear,
Figure 2 6 — In te r-A x le Differential In stalle d in A d a p t e r C a s e
CHEVROLET SERIES 70-80 HEAVY DUTY TRUCK S H O P M A N U A L