Chevrolet 1977 Monte Carlo, Repair Manual, Page: 121 / 428

REAR AXLE DIFFERENTIAL 4B-53
F ig . 4 B - 7 H - 3 / 4 T o n U n it
Internal clearances are such that shims, reaction blocks,
and thrust ring should not be replaced unnecessarily even if
slight wear indications are present. If shims, reaction blocks, or
thrust ring must be replaced due to damage, correct measure­
ment and replacement procedures must be followed. Failure
to do so may disturb critical clearances and could result in
differential complaints.
D isassem bly
1. R em ove ring gear and side bearings follow ing
procedures established for the standard differential.
2. R em ove (3) screws on front face o f ring gear flange.
3. Set unit on right side case h alf and gently pry apart
at yoke hole locations Fig. 4B-7H .
4. R em ove left side case half. To prevent side gear from
falling out, hold thum b against inside o f gear hub while
separating case halves.
5. Inspect com ponents for damage. If the governor
assembly and latching bracket are the only item s to be
replaced, rem ove and proceed to Step 7 o f reassem bly
procedure. Pry under pinion yoke and rem ove and proceed
with detailed inspection if further dam age is observed.
Inspection
1. Clean all parts with solvent. Inspect all bearings for
chipping or evidence o f excessive wear. R eplace parts as
needed.
2. Inspect all differential com ponents for excessive
wear and breakage. R eplace parts as needed. T H E
F O L L O W IN G A R E S E R V IC E A B L E C O M P O N E N T S
FO R T H IS D IF F E R E N T IA L .
• G overnor assem bly and latching bracket with spring.
• Cam Plate.
• Clutch disc pack with w ave spring and guide clips.
• Pinion yoke.
• Pinion gears.
• Pinion thrust washers.
• R eaction blocks (4 sizes).
• Thrust ring.
• Right side shim (4 sizes).
• Left side guide clips.
A ttem pts to service other com ponents will disturb
critical clearances and may result in differential failure. If
reaction blocks or right side shim must be replaced, the
original pieces m ust be carefully measured for thicknes and
replaced with a piece o f the sam e size.
C A M /C L U T C H S E R V IC E
D isassem bly
If cam plate or clutch discs must be replaced, the cam
gear sub-assem bly m ust be serviced as follows: Refer to
Figure 4B -9H .
1. M easure and record overall length o f gear assem bly
(front face o f gear to back side o f thrust ring, include shim).
This dim ension will be needed to reassemble unit if thrust
ring is replaced.
DO N O T REPLACE T H R U S T R IN G
U N LESS N E C E S S A R Y
. If ring is excessively worn or
scored, check bore in case for scoring. If bore is scored,
replace entire differential.
2. W ith gear hub end up, com press disc pack and install
jaw s o f split ring bearing rem oved (J-22912) between the
thrust ring and the top eared disc. Bevel side o f bearing
rem over should face up toward thrust ring.
3. Place cam gear assembly with bearing rem over
attached in an arbor press supporting the bearing rem over
on both sides.
4. Install a 1-1/2" to 1-3/4" diameter plug (J-8107-4)
on gear hub. Press against plug with ram o f press to rem ove
thrust ring. K eep all com ponents in the proper order.
Fig. 4 B -8 H -3 /4 Ton A ssem bly
O V E R H A U L M A N U A L