Manual Gearbox Mainshaft Bearing for Nissan ⚙️

Keep your transmission smooth, quiet, and reliable. This high-precision mainshaft bearing supports the primary shaft inside a Nissan manual gearbox, maintaining perfect alignment while transferring engine torque to the output gears. Built from hardened steel with tight clearances, it minimizes friction, controls heat, and prevents gear tooth wear.

Why you need it ✅

The main shaft must stay perfectly centered for correct gear mesh and synchro function. A quality bearing ensures clean shifts, stable load distribution, and long gearbox life—especially under towing, off-road, or highway use.

How it works

The inner race is pressed onto the shaft; the outer race seats in the case. Rolling elements carry radial and axial loads from helical gears while bathed in gear oil. Proper fit and lubrication keep rotation effortless and temperatures controlled.

What happens if it fails ⚠️

Growling or whine (often in 3rd/4th), metal glitter in oil, hard shifting, gear pop-out, and vibration. Continued driving can overheat the case, damage synchros and gears, or even crack/snap the shaft. Replace promptly; renew seals/snap rings and refill with correct GL-4 oil.

Pro install tips

Measure case bore and shaft journal, check endplay/preload, heat the housing and chill the bearing for clean seating, align oil feed, and torque to spec.

Compatibility

• Caravan/Homy Van
• Terrano2
• Caravan
• Frontier
• Cedric
• King Cab
• Atlas
• Caravan/Homy Coach
• Skyline
• Np300
• Truck
• Urvan
• Cedric/Gloria
• Datsun Truck
• Cabstar
• Silvia
• Xterra
• 200Sx
• Crew
• Nissan Truck Zn
• 240Sx
• Vanette Serena
• Desert Thunder
• Np300 F/Sbs,Med
• 180Sx