Pinion Depth
- Assemble depth gauge tool (T79P-4020-A) and install aligning adapter, gauge disc and gauge block to screw. Place rear pinion bearing over aligning disc and into bearing cup of carrier housing. Install front pinion bearing into front bearing cup. Place tool handle onto screw and hand tighten. See Fig 1.
- Install a 0.200" gauge disc spacer on ring gear side (left) of case between bearing cup and case. Install a 0.300" gauge disc spacer on pinion gear side (right) of case between bearing and case. Install bearing caps in original positions and tighten bolts to 30 INCH lbs.
- Install adjuster rod (T78P-4136-AB) into ring gear side (left) axle tube and retain in position with existing brake backing plate bolts and nuts. Tighten adjuster rod nut to 40 INCH lbs. to move differential case to right side of housing. Rotate differential case several times to seat bearings and recheck adjuster rod nut torque (maintain 40 INCH lbs.).
- Using a feeler gauge, select thickest blade that will enter between gauge disc and carrier bore on ring gear side of case. Feeler gauge should fit with slight drag. Remove and record feeler gauge thickness. Add 0.500" to feeler gauge thickness for total shim thickness. See Figure.
- Release adjuster rod enough to remove 0.300" gauge. Remove right bearing cap and 0.300" gauge. Install bearing preload spacer (T78P-4136-B2) between bearing cup and carrier bore. Reinstall bearing cap and tighten to 30 INCH lbs. Rock ring gear back and forth, while tightening adjuster rod until zero backlash is obtained. Using a feeler gauge, repeat step 4). Add 0.200" to feeler gauge thickness.
- Left shim thickness is total shim thickness recorded in step 5) MINUS 0.008". Right shim thickness is total shim thickness obtained in step 4) MINUS total obtained in step 5) PLUS 0.016". See Sample Calculation .NOTE: Side bearing shims are available in various thicknesses. If shim size required is not available, round DOWN to nearest size available.
SAMPLE CALCULATION
| Feeler Gauge Reading (Step 5) | .086" |
| PLUS Spacer Thickness | .200" |
| Total | .286 |
| MINUS | .008" |
| EQUALS LEFT Shim Thickness | .278" |
| Feeler Gauge Reading (Step 4) | .040" |
| PLUS Spacer Thickness | .500" |
| Total | .540" |
| MINUS Total (Step 5) | .286" |
| EQUALS | .254" |
| PLUS Preload Constant | .016" |
| EQUALS RIGHT Shim Thickness | .270" |