![]() ![]() There are two primary purposes for the dual wheel rear axle. All 1500, midsize pickups, single rear wheel vans use semi floating rear axles.Ī non floating axle would be a single shaft, mounted via bearings to the vehicle chassis. When the axle shaft comes out of the axle tube there is no associated wheel and tire on the vehicle. The axle shafts are retained in the axle housings either by c clips at the differential end (GM), or a bolted retainer plate for the axle bearing (Ford). The inboard end of the axle shaft is splined to transmit torque from the differential to wheel. The axle shafts have a single bearing pressed on the axle shaft at the outboard end, This bearing supports the axle shaft outboard end inside the axle tubes. Semi floating, the axle shaft and wheel hub are one piece and insert into the axle housing tubes. All GM HD (2500/3500) pickups have full floating rear axle, single rear wheel and dual rear wheel. Physically, on the full floating axle the axle shaft can be unbolted from the wheel hub and removed from the axle tube while the tire and wheels are still on the vehicle and the vehicle supported at it’s tires. The axle shaft is splined at the differential, and is bolted to the wheel hub on the outboard end thru a flange which is much smaller in diameter than the wheel hub’s lug nut pattern. An axle shaft transmits torque to the wheel from the differential. Similar to how a non unit bearing type front hub mounts to a spindle (like old RWD impala, malibu, nova, chevy II etc.).
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