Rears Parts For Sale

Rear axle assemblies, often called rears or rear ends, are a core driveline component in heavy-duty trucks. A complete rear typically includes the axle housing, differential or carrier, axle shafts, wheel ends, and often the brake and suspension mounting points tied to the assembly. Buyers usually start with ratio, axle capacity, brake type, and housing configuration because those specs determine whether the rear will match the truck’s intended service and existing driveline setup. Common applications include linehaul tractors, vocational trucks, dump bodies, mixers, and other severe-duty chassis where durability and correct gearing directly affect uptime.

Ratio is one of the first decisions to get right. A faster ratio such as 3.08 is commonly seen in highway tractors focused on fuel economy and lower cruise RPM, while deeper ratios are often preferred for heavier vocational work, startability, and low-speed pulling power. GAWR, tandem capacity, and differential features matter just as much. Buyers should confirm whether the assembly is a single or tandem rear, whether it includes a power divider, and whether the carrier style matches the existing setup. On tandem-drive trucks, matching front and rear inter-axle compatibility is critical. It is also smart to verify axle spline count, input yoke series, wheel-end style, and whether the housing is designed for a specific suspension configuration.

Brake and suspension details can make or break a parts swap. Some rear assemblies are equipped with air drum brakes, while others use air disc brakes that change service parts, wheel-end packaging, and maintenance cost. Suspension interfaces also vary widely, including four-bag air ride and other OEM-specific layouts. Buyers should check spring pad spacing, torque rod bracket locations, ABS sensor provisions, hub-pilot versus stud-pilot wheel ends, and axle track width before purchase. If the rear is being used as a replacement rather than a rebuild core, inspect for housing damage, spun bearings, excessive backlash, metal contamination, and wear in the differential lock or power divider components.

Meritor, Dana Spicer, Eaton, and Mack-spec rears are common in the market, but interchange is never something to assume. The safest approach is to match the axle model tag, ratio, capacity, brake package, and major mounting dimensions to the original component. For fleets trying to control downtime, a complete takeout rear can be the fastest path back into service. For shops rebuilding a truck in stages, the value may be in the carrier, axle shafts, or wheel-end hardware. A good rear assembly should match the truck’s duty cycle, driveline geometry, and maintenance plan, not just the bolt pattern.