3-4 FRONT AXLE DIFFERENTIAL
Examples of shim selectionMarkings on Pinions New Old Pinion Pinion +8 +5 -5 -3 +5 -4
4.
5.
6.
7.
+5 +8 -3 -5 -3 +2
D ifference Between Markings +3 -3 -2 +2 +8 -6
Amount To Change Each Shim Pack
8.
D ecrease Increase Increase D ecrease D ecrease Increase
9.
.003" .003" .002” .002” .008" .006"
W hen the approxim ate shim packs have been sleeted, install inner bearing shim pack in carrier and install cup, using Tool J 9276-2 to seat cup tight against shims. Insert pinion and inner bearing cone in carrier and install outer bearing shim pack on end of pinion. Install outer bearing cone, using Tool J-5590 to seat bearing tight against shim pack. D o not install oil seal at this time. Install pinion flange, w asher and nut, using Tool J-8614 to hold flange while tightening nut to 210 ft. lbs. torque. D eterm ine proper pinion depth using Pinion D epth Gauge, Tool J- 5341, with Tool J-7892 (SE-1065-1, (2)-5, (2)-6, (2)-9SS, (1)-10, (l)-58 with 1" microme ters). W hen using the m icrom eter gauge, the actual pinion depth setting can be determ ined by adding the m icrom eter gauge reading to the thickness of the step plate and com paring the result with the nominal dimen sion of 2.625" plus or m inus the m arking on the face of the pinion. If the difference in the two figures is less
10.
than minus .001" to plus .003", the pinion depth is satisfactory. If not, change pinion bearing shim packs to make the two figures correspond within the specified limits. Using a troque wrench calibrated in inch pound and a suitable socket, check pinion bearing preload. The rotating torque of the pinion shaft should be 10 to 20 inch pounds. A dd or remove shims behind the outer bearing cone to bring preload within limits. W hen pion depth and bearing preload are within limits, install differential in carrier, adjust differential bearing preload and ring gear backlash and complete the axle assembly as outlined under "D ifferential-Installation." Remove flange and install slinger, new oil seal, flange and propeller shaft. NOTE: If not completely assembled, refer back to Step 3, page 3-1 to install differential into carrier housing.
11.
Fill unit with recommended lubricant, lower vehicle on hoist, and road test vehicle.
AXLE SHAFT GUIDE AND OIL SEAL REPLACEMENT The axle shaft guides and oil seals, located just outboard of the differential bearings, can be replaced only after re moval of the differential. 1. Remove differential as outlined previously. 2. Drive the guides and seals inboard out of carrier. 3. Install new guides in tube. 4. Lubricate new oil seals and install in tube, with lip of seal inboard, with J-8 107-4.
CHEVROLET OVERHAUL MANUAL
