PINION DEPTH-BEARING PRELOAD-GEAR BACKLASH



Ring gear and pinion are supplied as matched sets. Identifying numbers for the ring gear and pinion are painted onto the pinion gear shaft and the side of the ring gear. A plus (+) number, minus (–) number or zero (0) along with the gear set sequence number (2) (01 to 99) is on each gear. This first number (1) the amount (in thousandths of an inch) the depth varies from the standard depth setting of a pinion marked with a (0). The next two numbers are the sequence number of the gear set. The standard depth provides the best teeth contact pattern.



Compensation for pinion depth variance is achieved with select shims (4). The shims are placed behind the rear pinion bearing.

If installing a new gear, note the depth variance number of the original and replacement pinion. Add or subtract this number from the original depth shim/oil slinger to compensate for the difference in the depth variances. The numbers represent thousands of an inch deviation from the standard. If the number is negative, add that value to the required thickness of the depth shims. If the number is positive, subtract that value from the thickness of the depth shim.

Pinion Gear Depth Variance Chart: Note where Old and New Pinion Marking columns intersect. Intersecting figure represents plus or minus the amount needed.


PINION GEAR DEPTH VARIANCE

Original Pinion Gear Depth Variance
  		Replacement Pinion Gear Depth Variance
  
−4
  		−3
  		−2
  		−1
  		0
  		+1
  		+2
  		+3
  		+4
  		    
+4
  		+0.008
  		+0.007
  		+0.006
  		+0.005
  		+0.004
  		+0.003
  		+0.002
  		+0.001
  		0
  		  
+3
  		+0.007
  		+0.006
  		+0.005
  		+0.004
  		+0.003
  		+0.002
  		+0.001
  		0
  		−0.001
  		  
+2
  		+0.006
  		+0.005
  		+0.004
  		+0.003
  		+0.002
  		+0.001
  		0
  		−0.001
  		−0.002
  		  
+1
  		+0.005
  		+0.004
  		+0.003
  		+0.002
  		+0.001
  		0
  		−0.001
  		−0.002
  		−0.003
  		  
0
  		+0.004
  		+0.003
  		+0.002
  		+0.001
  		0
  		−0.001
  		−0.002
  		−0.003
  		−0.004
  		  
−1
  		+0.003
  		+0.002
  		+0.001
  		0
  		−0.001
  		−0.002
  		−0.003
  		−0.004
  		−0.005
  		  
−2
  		+0.002
  		+0.001
  		0
  		−0.001
  		−0.002
  		−0.003
  		−0.004
  		−0.005
  		−0.006
  		  
−3
  		+0.001
  		0
  		−0.001
  		−0.002
  		−0.003
  		−0.004
  		−0.005
  		−0.006
  		−0.007
  		  
−4
  		0
  		−0.001
  		−0.002
  		−0.003
  		−0.004
  		−0.005
  		−0.006
  		−0.007
  		−0.008
  		  


PINION DEPTH MEASUREMENT



Measurements are taken with pinion bearing cups and pinion bearings installed in the housing. Take measurements with Pinion Gauge Set and Dial Indicator C-3339A (1).

















DIFFERENTIAL BEARING PRELOAD AND GEAR BACKLASH





Mark lowest backlash position on the ring gear and make all backlash measurements at this location.








If backlash is less than 0.12 - 0.20 mm (0.005 - 0.008 in.) increase right-side threaded adjuster torque until specified backlash is obtained. If backlash is more than 0.12 - 0.20 mm (0.005 - 0.008 in.) repeat procedure from the beginning.




After the proper backlash is achieved, perform the Gear Contact procedure.


GEAR CONTACT PATTERN