High‑Precision Transmission Main Shaft Bearing ⚙️

This OE‑grade gearbox main shaft bearing keeps the transmission core running true. It supports the main shaft, holds correct preload, and keeps gears perfectly aligned for smooth, quiet shifts. Choose it when restoring factory feel, fixing whining noises, or preventing early wear after clutch or fluid service.

Why you need it

It reduces friction and heat, stabilizes the shaft under load, protects synchronizers, and preserves gear tooth contact. A healthy bearing means crisp engagement and long gearbox life.

How it works

Hardened races and precision rolling elements carry radial and thrust loads while maintaining an oil film. The bearing centers the shaft in the case, preventing wobble and gear misalignment during acceleration and coasting.

If worn or failed ❗

Expect rising road‑speed whine, growl on cold start, vibration, rough shifts, or gear pop‑out. Metal flakes in oil, leaking seals, overheated synchros, chipped gears, and even case damage can follow if ignored.

Tech notes

Press by the correct race, set endplay to spec, renew seals and fluid, and road‑test. Ideal for OEM‑spec repairs on popular Nissan/Infiniti applications.

Compatibility

• Q60/G Coupe
• Q40/G Sedan
• G35
• Q60/G Convertible
• G37 Sedan