Pontiac FIREBIRD 1972 Service Manual page 375

TYPE C STANDARD DIFFERENTIAL 4C-7
Fig. 4C-12 Installing Front Pinion Bearing Outer Race
5-8619-12 (B, X, and F Series) into carrier assembly
and tighten hex nut to 20-25 lb. in. (new bearings) or
10-15 lb. in. of (old bearings) which is sufficient
torque to rotate the bearings. Position 5-21777-23,
5-2 1777-26 or 5-2 1777-2 pointing upwards. See Fig.
4C- 14.
NOTE: For an explanation of when and why
gauging is necessary, see Section 4A.
4. Make certain differential side bearing support bores
are clean and free of burrs.
5. Position the dial indicator, J 8001, on the mounting
post of the gauge shaft with the contact button touch-
ing the indicator pad. Set the dial indicator on zero,
then depress the dial indicator until the needle rotates
3/4 turn clockwise. Tighten the dial indicator in this
position.
6. Install J 21777-3 (all exc. F Series and B Series "G"
or
"K"
codes axles) or 5-8619-10 (all F, X, and B
Series, "G" or "K" coded axles) discs on gauge shaft
OUAOL PLATE
1-11717211A
AND
O I F R l E S i
1-2>1111<8 S l l l l L S
P
COOED AXLLSI
211111bl8 AND F SLRlCb G OR K CODTI1 AXLES)
\ \
Fig. 4C-14 Pinion Gage Tools
assembly and position in the carrier so that the dial
indicator contact rod is directly over the gauging area
of the gauge plate. NOTE: The discs must be fully
seated in the side bearing bores. (Fig. 4C-14 and 4C-
15).
Position gauge shaft so that the dial indicator rod
contacts the gauging area. Rock gauge shaft slowly
back and forth until the dial indicator records the
greatest deflection, (the point where dial indicator
needle changes rotational direction). At the point of
largest deflection, set dial indicator to zero. Repeat
rocking action of gauge shaft to verify the zero set-
ting.
8. After the zero setting is obtained, rotate gauge shaft
until the dial indicator rod is removed from the gaug-
Fig. 4C-13 Installing Rear Pinion Bearing Outer Race
Fig. 4C-15 Pinion Setting Gage Assembly Installed