Timken 394A Tapered Roller Bearing Cup

Product Description

The TIMKEN 394A is a tapered roller bearing cup, also called the outer race, designed to work in conjunction with a matching tapered roller bearing cone. The cup seats in the housing bore and provides the hardened raceway surface that the tapered rollers run against. This design allows the bearing assembly to manage both radial and axial (thrust) loads simultaneously. The 394A is machined to TIMKEN dimensional standards and is engineered for durability in compact bearing envelopes. Licensed technicians in drivetrain, axle, and differential service applications install this component as part of a complete bearing replacement.

This cup is identified in application data for rear axle and differential service on select rear-wheel-drive vehicles, including front wheel and rear wheel inner and outer tapered roller bearing positions. Application references in the source data include FW-RWD and RW-RWD positions from 1950 through 1971 and rear axle differential service from 1982 through 1991. It is suited for medium-duty and passenger vehicle drivetrain service where tapered roller bearing assemblies are specified by the OEM.

Key Features

• Hardened outer race cup provides the load-bearing raceway surface for tapered roller contact
• Handles combined radial and axial loads in a single compact bearing position
• Engineered to TIMKEN dimensional tolerances for consistent fit in housing bores
• Sold individually; TIMKEN recommends replacing the cone and cup together to maximize service life
• Suited for rear axle, differential, and wheel bearing service on rear-wheel-drive applications

Compatibility

Application data references FW-RWD INT TK positions (1954-1961), RW-RWD INT TK positions (1950-1971), and rear axle differential service (1982-1991) on medium-duty and passenger vehicle platforms. Always confirm housing bore diameter and cone part number match before installation.

Installation Notes

Tapered roller bearing cups are pressed into a machined housing bore and should be installed by a qualified drivetrain or axle technician using the appropriate bearing driver set to avoid cocking or scoring the raceway. The vehicle should be safely lifted, supported on stands, and the axle or hub assembly fully disassembled before cup removal or installation. Always replace the cup and cone as a matched set and verify correct endplay or preload adjustment per the vehicle service manual after assembly. Refer to applicable SAE and OEM service standards for torque and adjustment procedures.