UA80E Transmission Drive Transfer Gear Bearing Set

A two-piece drive transfer gear bearing set for the Toyota UA80E and UA80F eight-speed transaxle, replacing part number BA79Z-2. Fitment covers Toyota Highlander 2017-2022, Camry and Avalon 2018-2022, Sienna 2020 and Lexus ES 350 2019-2022. Both bearings for the transfer gear are supplied together.

The drive transfer gear carries engine torque across from the geartrain to the differential on this transaxle, and its bearings live under constant load. When they wear, the noise is speed-dependent rather than gear-dependent - it rises with road speed, stays with you when you lift off, and does not change when the unit shifts. That is the tell that separates a transfer bearing from a clutch or planetary complaint.

Owners usually describe it as a hum or growl that starts around 30 mph and gets louder with speed, sometimes with a vibration through the floor. Left alone the bearing eventually lets the gear walk, which puts the mesh out of position and starts chewing teeth - at that point the repair is a geartrain, not a bearing set.

Both bearings go in as a pair. Replacing one and leaving its mate in place puts a new race against a worn one and the noise comes back inside a year. Press them in square with the driver bearing on the race being pressed, and set transfer gear preload with a selective shim rather than guessing - preload is what decides whether the new bearings last.