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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Today's free-running hubs are very simple to operate and feature seals that prevent the entry of dirt and moisture. Automatic locking hubs are used in many applications. They use the front axle shaft rotation to actuate a cam that locks and unlocks the hub.
There are two types of front hubs currently in use on Ford Trucks:
^ Manual (or free-running) that require the driver to get out of the cab to either lock or unlock them.
^ Automatic locking (they lock automatically when the axle shaft begins to turn).
The vehicle operator doesn't have to wait until the last minute (or when stuck) to lock the hubs. It makes sense to plan ahead and lock them at a convenient time. The hubs can be left in the locked position all the time if desired. For example, if the vehicle is constantly going from the highway to off the road conditions and back, it's not necessary to lock or unlock every time. If the vehicle is equipped with a manual shift transfer case and manual locking hubs, low range can be selected when the vehicle's front hubs are unlocked. This is useful for short distances if very low, creeper gearing (but not 4WD) is needed. For example, backing an empty boat trailer down a launching ramp is best accomplished in 2WD. Once the boat is loaded, 4L (low) can be selected to help pull the boat up the ramp. The hubs don't have to be locked for this purpose, and being in 2WD will prevent driveline windup while maneuvering in the boat ramp parking lot.
![autolock8593.jpg 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.
[url=https://www.supermotors.net/registry/media/1171772][img]https://www.supermotors.net/getfile/1171772/thumbnail/splinew23.jpg[/img][/url] . [url=https://www.supermotors.net/registry/media/1168847][img]https://www.supermotors.net/getfile/1168847/thumbnail/splinewasher.jpg[/img][/url] . [url=https://www.supermotors.net/registry/media/1171798][img]https://www.supermotors.net/getfile/1171798/thumbnail/hubpts5new23.jpg[/img][/url]
'80-93 Front Rotor [url=http://www.amazon.com/dp/B000C5FDOQ/]MotorCraft BRR8[/url]
'79-85 Front Pads [url=http://www.amazon.com/dp/B000C5DBKY/]Motorcraft BR43B[/url]
'86-93 Front Pads [url=http://www.amazon.com/dp/B000C5DC30/]Motorcraft BR41B[/url]
'94-96 Front Pads [url=http://www.amazon.com/dp/B000C5DBS6/]Motorcraft BR46[/url]
'94-96 Front Rotor [url=http://www.amazon.com/dp/B000C5DE7O/]Motorcraft BRR56[/url]
[url=http://www.supermotors.net/registry/media/895156][img]http://www.supermotors.net/getfile/895156/thumbnail/hublock5scrx.jpg[/img][/url] . [url=http://www.supermotors.net/registry/media/170464][img]http://www.supermotors.net/getfile/170464/thumbnail/autolock5screw.jpg[/img][/url] . [url=http://www.supermotors.net/registry/media/757655][img]http://www.supermotors.net/getfile/757655/thumbnail/autolock8593.jpg[/img][/url] . [url=http://www.supermotors.net/registry/media/479613][img]http://www.supermotors.net/getfile/479613/thumbnail/autolock5parts.jpg[/img][/url] . [url=http://www.supermotors.net/registry/media/470241][img]http://www.supermotors.net/getfile/470241/thumbnail/autohublocksop.jpg[/img][/url] . [url=http://www.supermotors.net/registry/media/470473][img]http://www.supermotors.net/getfile/470473/thumbnail/tsb970628motoringtorque.jpg[/img][/url]
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Today's free-running hubs are very simple to operate and feature seals that prevent the entry of dirt and moisture. Automatic locking hubs are used in many applications. They use the front axle shaft rotation to actuate a cam that locks and unlocks the hub.
There are two types of front hubs currently in use on Ford Trucks:
^ Manual (or free-running) that require the driver to get out of the cab to either lock or unlock them.
^ Automatic locking (they lock automatically when the axle shaft begins to turn).
The vehicle operator doesn't have to wait until the last minute (or when stuck) to lock the hubs. It makes sense to plan ahead and lock them at a convenient time. The hubs can be left in the locked position all the time if desired. For example, if the vehicle is constantly going from the highway to off the road conditions and back, it's not necessary to lock or unlock every time. If the vehicle is equipped with a manual shift transfer case and manual locking hubs, low range can be selected when the vehicle's front hubs are unlocked. This is useful for short distances if very low, creeper gearing (but not 4WD) is needed. For example, backing an empty boat trailer down a launching ramp is best accomplished in 2WD. Once the boat is loaded, 4L (low) can be selected to help pull the boat up the ramp. The hubs don't have to be locked for this purpose, and being in 2WD will prevent driveline windup while maneuvering in the boat ramp parking lot.](https://www.supermotors.net/getfile/757655/fullsize/autolock8593.jpg)