GMC T Series 1994 Repair Manual page 187

CONDITION:
• BACKLASH CORRECT.
• PINION DEPTH INCORRECT-PINION GEAR
IS TOO FAR AWAY FROM RING GEAR.
TOE
HEEL
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DRIVE SIDE
COAST SIDE
(CONVEX)
CORRECTION:
INCREASE THE PINION SHIM THICKNESS.
SERVICE HINTS:
HOW TO CHECK PATTERNS:
• BRUSH GEAR MARKING COMPOUND
ON THE RING GEAR TEETH.
• ROTATE THE PINION SIX TIMES CLOCKWISE
AND SIX TIMES COUNTERCLOCKWISE.
• OBSERVE THE TOOTH CONTACT PATTERN
AND MAKE ANY NECESSARY CORRECTIONS.
HEEL
(CONCAVE)
CONDITION:
• BACKLASH CORRECT.
• PINION DEPTH INCORRECT-PINION GEAR
IS TOO CLOSE TO RING GEAR.
TOE
DRIVE SIDE
(CONVEX)
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 THE INNER PINION BEARING CUP
AND THE REAR AXLE HOUSING.
CONDITION:
• BACKLASH CORRECT.
• PINION DEPTH CORRECT.
TOE
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 THESE BEARING PRELOAD SETTINGS:
• TOTAL ASSEMBLY
• DIFFERERTIAL CASE
• PINION
IF THESE SETTINGS ARE GOOD, LOOK FOR
DAMAGED OR INCORRECTLY ASSEMBLED PARTS.
COAST SIDE
(CONCAVE)
COAST SIDE
(CONCAVE)
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