Chevrolet Chevelle 1977 Repair Manual page 138

4B-66
Fig. 23F— In sta llin g Inner Pinion Cone and Roller
p in io n sh aft using Tool J-5590 and com panion
flange to press b earin g onto pinion, as in figure
24F.
8. Install flange holding b a r and install w asher and
n ut on pin io n shaft. T orque nut to 255 ft. lbs.
9. Rem ove holding b a r and w ith an inch pound torque
w rench m easure ro tatin g torque. R otating torque
should be 10 to 20 in. lbs. w ith original bearings or
20 to 40 in. lb. w ith new bearings.
N O T E: T orque re ad in g to start shaft turning
m ust be d isregarded.
10. If torque req uirem ents
specifications, adjust
Increase the outer shim pack to reduce ro tatio n
torque. D ecrease shim pack to increase ro tatin g
torque.
11. Rem ove nut, w asher and flange from pinion shaft.
12. Install oil slinger, gasket and using Tool J-22804
install oil seal.
Fig. 24F—Installing Pinion Flange
OVERHAUL MANUAL
(preload) are not to
shim pack as necessary.
13. Install flange, w asher and nut. Torque n u t to
specifications.
DIFFERENTIAL CASE
Preload and Adjustment
1. Place differential assem bly (with pinion assem bled)
into housing. Install bearin g caps in their p ro p er
position and tighten screws ju st enough to hold the
b earin g cups in place.
2. Install dial in d icator on carrier w ith in d icato r
button contacting back o f ring gear, as in figure
19F.
3. Place two screw drivers betw een bearing cup and
housing on ring gear side o f case, and pry ring gear
into m esh w ith pin io n gear as far as it will go. Rock
ring gear to allow bearings to seat and gears to
mesh. W ith force still applied, set indicator to "O " .
4. R eposition screw drivers on opposite side o f rin g
gear and pry ring gear as fa r as it will go. Now take
an in dicator reading. R epeat until the sam e re ad in g
is obtain ed every tim e. T his reading will be the
necessary am ount o f shim s between the differential
case and differential b earin g on the ring gear side.
Rem ove differential bearing from the ring gear side
and assem ble p ro p er am ount o f shims. R eassem ble
bearing.
5. Rem ove the differential bearing from the opposite
side o f ring gear. To determ ine the am ount o f
shim s needed here, use the following m ethod.
a. S ubtract the size o f shim pack just installed on
rin g gear side o f case from the reading ob tain ed
and recorded in step 10 o f D ifferential C ase—
R eassem bly.
b. To this figure, add an ad d itio n al .015" shim s to
com pensate fo r preload and backlash.
Exam ple: If read in g in step 10 o f D ifferential C ase—
R eassem bly was .085", and the shim s installed on
ring gear side o f case was .055", the correct am ount
o f shim will be .085" — .055" + .015" = .045".
6. Install shim s as indicated in step 5, (which will give
the p ro p e r b earin g preload and backlash) and
install side bearing.
Installation
1. S pread differential carrier, using sp reader as shown
in figure 15F.
2. Install differential bearin g outer races in th eir
correct location, then install differential case into
carrier.
3. Install differential b earin g caps in
location as indicated by m arks m ade at disassem ­
bly. Install cap screws
differential assem bly and ra p on case w ith a soft
faced h am m er to ensure pro p er seating o f case in
carrier.
R em ove sp re a d e r
specifications.
the correct
finger tig h t. R o tate
and to rq u e cap bolts to