Big Ford Axle Bearings

The Mark Williams Big Ford Axle Bearings (MPN 58504) are precision roller bearings engineered for heavy-duty Ford rear axle applications where stock bearings fall short of performance demands. Whether you're building a street machine, drag strip competitor, or off-road rig, these bearings deliver the durability and load capacity needed when you're pushing power beyond factory specifications. They're essential for any serious Ford enthusiast upgrading to larger tires, higher horsepower, or extreme torque outputs.

Mark Williams bearings are manufactured to tight tolerances and feature robust steel construction designed to handle radial and thrust loads that would compromise inferior alternatives. These are roller bearings, not the sintered bronze found in many OEM setups, meaning they offer superior longevity under sustained acceleration and cornering forces. The compact design—measuring 4.45 × 4.35 × 4.9 inches and weighing 2.75 lbs per unit—fits within factory Big Ford axle housings while providing the structural integrity needed for reinforced axle shafts and higher gear ratios common in modified vehicles.

These bearings are ideal for owners upgrading Big Ford rearends in classic Mustangs, F-series trucks, Broncos, and other vintage Ford platforms where axle durability becomes the limiting factor in performance builds. Installation requires proper setup to maintain correct endplay and preload—critical tolerances that prevent premature bearing failure under load. Pair them with quality seals and fresh gear oil during installation to maximize service life and ensure your rear axle assembly can reliably transmit the power your engine produces.