1942 - 1947 CHEVROLET SHOP MANUAL

Section 4  - Rear Axle, Universal Joints & Springs

4-7
2. Place the differential case in the "V" blocks of the checking fixture U-4 and indicate the run-out of both the ring gear pilot and the case flange, Fig. 10. Neither of these run-outs should exceed .001".
flush with the face of the case. Remove the guide pins and install the remaining bolts.
Tighten all ring gear bolts.
NOTE—New lockwashers should under the head of each bolt.
be used
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With the assembly mounted in "V" blocks, check the run-out of the back face of the ring gear with a dial indicator. Fig. 12. This run­out must not exceed .004".
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Fig. 10—Checking Run-Out of Differential Case
When replacing the ring gear, it is good prac­tice to use five guide pins made by cutting the heads from 3/8"—24 cap screws about 1-1/2" long. Slots should be cut in the heads of these guide pins so that they may be easily removed. In­stall these guide pins in alternate bolt holes in the ring gear, Fig. 11, and slip the ring gear over the pilot diameter of the case, making sure
Fig. 12—Checking Run-Out of Back Face of Ring Gear
Assembling the Rear Axle
1.   Assemble the same thickness of shims in the counterbore of the propeller shaft housing that were removed when the assembly was taken down (if the original ring gear and pinion are to be used), making sure that the shims are flat in the counterbore and are not cocked. The total thickness of the shims will be found to be from .030" to .036" and usually .033". Shims are serviced in thicknesses of .012", .015", .018", and .021" so that a combination of shims may be selected to replace the original ones if they are damaged.
NOTE—Whenever a new ring gear and pinion is installed, one .015" shim and one .018" shim should be used as this is the standard setup.
2.   Coat the beveled surface of the pinion bearing lock sleeve with rear axle lubricant, and as-
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Fig. 11—Use of Guide Pins in Ring Gear
that the back face of the ring gear and the face of the case are free from dirt and burrs. Install every other ring gear bolt and draw them up evenly and snugly so that the ring gear face is

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