GMC T Series 1994 Repair Manual page 142

CONDITION:
• BACKLASH CORRECT.
• PINION DEPTH IN C O R R E C T-PIN IO N GEAR
IS TO O FAR AWAY FROM RING GEAR.
TOE
DRIVE SIDE
(CONVEX)
CORRECTION:
INCREASE THE PINION SHIM THICKNESS.
SERVICE HINTS:
H O W TO CHECK PATTERNS:
• BRUSH GEAR MARKING CO M PO UND
ON THE RING GEAR TEETH.
• APPLY BRAKES SO THAT THE PINION CAN
BE ROTATED W ITH 50 LB. FT. EFFORT.
• ROTATE TH E PINION SIX TIM ES CLOCKWISE
AND SIX TIM ES COUNTERCLOCKW ISE.
• OBSERVE THE TOO TH CONTACT PATTERN
AND MAKE ANY NECESSARY CORRECTIO NS.
COAST SIDE
(CONCAVE)
CONDITION:
• BACKLASH CORRECT.
• PINION DEPTH INCO RRECT-PINIO N GEAR
IS TO O CLOSE TO RING GEAR.
CORRECTION:
DECREASE THE PINION SHIM THICKNESS.
SERVICE HINTS:
PINION DEPTH SHIM LOCATIONS:
• BETWEEN THE INNER PINION BEARING CONE
AND THE HEAD OF THE PINION GEAR.
• BETWEEN HTE INNER PINION BEARING CUP
AND THE REAR AXLE HOUSING.
CONDITION:
• BACKLASH CORRECT.
• PINION DEPTH CORRECT.
TOE
HEEL A
DRIVE SIDE
(CONVEX)
CORRECTION:
NONE.
SERVICE HINTS:
PATTERNS THAT MAY VARY MAY BE CAUSED BY LOOSE
BEARINGS ON THE PINION OR THE DIFFERENTIAL CASE
CHECK TH ESE BEARING PRELOAD SETTINGS:
• TOTAL ASSEMBLY
• DIFFERERTIAL CASE
• PINION
IF THESE SETTING S ARE GOOD, LOOK FOR
DAMAGED O R INCORRECTLY ASSEMBLED PARTS.
HEEL
COAST SIDE
(CONCAVE)
3704r4220