Pictured above are the original Model A Ford script service tools used by dealers to remove and install the large lock nuts which retain the rear axle pinion gear bearings in the rear differential housing race.
| Tool Number |
Wrench Size inches |
Pinion Nut Size inches |
Application |
|---|---|---|---|
| 5Z-1833 | 2-1/16 | 2 | Early 1928 drive shaft mounted pinion nuts |
| 5Z-2065 | 2-3/16 | 2-1/8 | 1929-32 pinion gear mounted pinion nuts |
The upper wrench is Ford service tool number 5-Z-1833, and is used for the 1928 pinion bearing nuts which were threaded directly onto the drive shaft, not onto the pinion gear.
The lower wrench is Ford service tool number 5-Z-2065, and is used for the larger 1929-32 pinion bearing nuts which were threaded onto the pinion gear itself.
These are forged steel tools, many of which were originally cadmium plated.