F 350 2WD Pickup V8-7.3L DSL (1988)
Input Shaft: Adjustments
TAPERED ROLLER BEARING
Measurement and adjustment of tapered roller bearing if necessary is a housing, countershaft, mainshaft, or input shaft has been replaced, or if a
tapered roller bearing has been replaced. The mainshaft, input shaft and countershaft should be adjusted to provide a 0.00079-0.00434 inch
preload. After adjusting the two shafts, each should be rotated a few times to center the rollers on bearings.
INPUT SHAFT AND MAINSHAFT BEARING
1. With transmission mounted on a suitable holding fixture, output flange upward, attach a suitable dial indicator to output flange with indicating bar
on end of mainshaft.
2. Zero dial indicator, then using a suitable pry bar, pry up on end of input and mainshaft and note indicator reading.
3. A shim and shaft seal, to be fitted, should have a combined thickness equal to dial reading plus 0.00070-0.00434 inch. This will result in a
specified preload after installation of shims, shaft seal, mainshaft and countershaft.
MAINSHAFT AND INPUT SHAFT BEARING PRELOAD
1. After measuring tapered roller bearing preload measurements, place transmission in upright position, input shaft facing downward.
2. Drive two dowel pins out of their holes in front and rear cases, then lift front case from rear case.
3. Using a suitable slide hammer and puller, remove countershaft and mainshaft tapered roller bearing outer races from case.
4. Fit each race with shim washer or shim washer and shaft seal to obtain required preload previously determined.
5. Countershaft preload is established by using shims alone.
6. Input shaft and mainshaft preload is established by using shims and a baffle.
7. Install components beneath outer race or tapered roller bearing which seats in front case.
8. Apply a suitable sealant to mating surfaces of front and rear cases.
NOTE: Do not use silicone.
9. Position front case on rear case, then install all attaching screws and torque to 16 ft lbs.
