5-Screw Automatic Hub Locks
The 3 parts labelled 3B458 are the shim washers. The outer is splined steel; the middle is fiber/plastic; the inner is smooth steel. Install three washers in order: metal washer first, plastic washer second and splined washer last. They bear the stub shaft's thrust load (caused by the C-ring), and keep it fully OUTboard so the U-joint stays aligned between the ball joints, and so the outboard small snap ring used on manual hub locks can be installed. Early axles had a single solid steel splined spacer instead of these 3.
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'80-93 Front Rotor
MotorCraft BRR8'79-85 Front Pads
Motorcraft BR43B'86-93 Front Pads
Motorcraft BR41B'94-96 Front Pads
Motorcraft BR46'94-96 Front Rotor
Motorcraft BRR56
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