Transmission main shaft bearing, Four-point. Porsche 964  ❭  99905209801

Transmission main shaft bearing, Four-point.
This four-point contact bearing is used in the manual transmission main/input shaft area on Porsche 964 applications. Four-point contact bearings are designed to manage combined loads in compact packaging - supporting stable shaft positioning and smooth rotation under varying operating conditions.

Fits:
Porsche 964 1989 - 1994

Diagram ref no 16

A worn bearing can introduce vibration, noise, imprecise shifting, and accelerated wear of related transmission components. Replacing it during gearbox servicing helps restore smooth operation, correct shaft support, and long-term reliability - especially important on performance-oriented drivetrains like the Porsche 964.

It supports the transmission main shaft and helps keep internal gear alignment stable under load. By maintaining correct shaft position, it reduces friction, noise, and wear - supporting smoother shifting and consistent drivetrain performance.

Function:
•  Provides precise main/input shaft support inside the gearbox
•  Helps manage axial and radial loads through four-point contact design
•  Maintains correct gear mesh alignment to reduce wear and noise
•  Supports smooth rotation and consistent transmission performance

Transmission bearings are critical to shaft stability and gear alignment. If this bearing wears, it can lead to whining noises, vibration, shifting issues, and increased wear on gears and synchros. Replacing it with an OE Match bearing helps restore gearbox integrity and protects more expensive transmission components.

When to replace:
•  Gearbox whining, rumbling, or grinding noises
•  Vibration or roughness that changes with speed/load
•  Excessive shaft play found during teardown/inspection
•  During gearbox rebuild/overhaul (preventative replacement)
•  Visible pitting, heat marks, or rough rotation on the bearing

Related reference numbers
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99905209801

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