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Locking hubs, also known as free wheeling hubs are fitted to some (mainly older) four-wheel drive vehicles, allowing the front wheels to rotate freely when disconnected (unlocked) from the front axle. This is done to reduce the mechanical resistance of the front-portion of the drivetrain when four-wheel drive is not in use. [1]
A roller bearing between the axle hub and axle shaft ensures easy rotation of the non-drive wheels. On the axle side, it is mounted to the holding bracket from the chassis; on the disc side, the wheel is mounted to the bolts of the WHA. When replacing, a wheel hub assembly should be torqued to the vehicle's specifications to prevent failure. [1]
Front Axle. GM 1967-1976 K5(Blazer/Jimmy)/K10/K20 (Passenger side) Some 1977 K5 Blazers came with Dana 44s in the front, others came with a Corporate 10 bolt solid front axle. Dana 44s were also used as front axles in 4x4 converted full size Chevrolet and GMC vans by Pathfinder Equipment Company from 1973 to 1989. Dodge
Both front-wheel drive and four-wheel drive are available. The Patriot features two four-wheel drive systems both of which are electronically controlled. The standard four-wheel drive system is called Freedom Drive I. This is a full-time Automatic 4WD that directly drives the front differential carrier from the transmission output and is ...
Front beam axle suspension is unusually sensitive to any lack of concentricity in the hub and wheel assembly which can cause a side-to-side oscillation ("shimmy") of the steering at certain speeds (typically 60–80 km/h; 40–50 mph), commonly referred to as "death wobble" within the 4×4 community. [3]
A gerotor pump is connected between the front and rear output shafts and senses any speed difference between them. When the shafts are turning at different speeds (wheel slippage), the pump supplies oil under pressure to a wet clutch pack. The clutch pack applies progressive 0 to 100% locking between the front and rear output shafts.