Disassembly ("F" Series Super Duty)

Remove parking brake assembly. Refer to TRANSMISSION MOUNTED PARKING BRAKE under REMOVAL & INSTALLATION. Mount parking brake assembly in vise using brass jaw protectors. Using Lock Nut Socket (T70T-4252-D), remove lock nut from mainshaft. Using a 3-jaw puller or a press with Adapter, remove mainshaft, brake drum and output flange. See Fig 1.

Fig 1: Removing Lock Nut, Mainshaft, Brake Drum & Output Flange ("F" Series Super Duty)
Remove snap ring holding speedometer drive gear onto shaft, and then remove speedometer drive gear. Using Puller (D80L-1002-L) with Bearing Cone Remover (D79L-4621-A) and Step Plate (D80L-630-6), remove inner bearing cone from mainshaft.
Remove parking brake assembly from vise. Turn brake assembly over, and mount threaded end of mainshaft in vise using brass jaw protectors. Remove 4 nuts attaching output flange and brake drum to output shaft. Remove brake drum and flange from output shaft.
NOTE: Drum, flange and mainshaft are balanced as a unit. They must be marked to ensure parts are assembled in same position.
Using Bearing Cup Puller (T77F-1102-A), remove output shaft oil seal, spacer, "O" ring, bearing and bearing cup from input shaft end of case. Remove splash shield and brake assembly from case. See Fig 2. Remove brake actuating lever and lever spring from case.
Using Bearing Cup Puller (T77F-1102-A), remove outer bearing cup. Unscrew and remove vent from case.

Fig 2: Removing Splash Shield & Brake Assembly ("F" Series Super Duty)