Differential rebuild kit Porsche 911 1987–89 G50 gearbox cars  ❭  99905906400

Differential rebuild kit for Porsche 911 1987–1989 G50 gearbox cars by OE Match, suitable for selected 911 3.2 G50 and 3.3 Turbo (930) models.

What This Product Does This kit provides the core components typically required to overhaul the rear differential assembly on G50-equipped Porsche 911 models, helping restore correct internal clearances and consistent operation of the unit.

Kit includes: 

1 x Differential outer bearing, (Ref: 99905906400) 
1 x Taper roller bearing. (Ref: 99905902702) 
6 x Differential Housing Lock Plate. (Ref: 90133228501) 
12 x Hexagon-head bolt (Ref: 92833227606)

Functions

• Supports refurbishment of worn differential internals
• Helps re-establish correct bearing support and gear contact
• Assists in reducing internal play and backlash when set up correctly
• Provides parts needed for a planned diff rebuild alongside other drivetrain work

Symptoms of Fault

• Whining or howling noises from the rear at cruise or on overrun
• Clunks when taking up drive or during gear changes
• Noticeable backlash or “thud” in the driveline
• Oil leaks from differential side seals or input area
• Vibration or roughness that changes with road speed
• Reduced or inconsistent traction on cars with limited-slip units

Why Replacement Matters

Over time, bearings, shims and internal hardware in the rear differential wear, especially on older Porsche 911 models that see mixed road use and age-related degradation. Refreshing these parts during a rebuild helps stabilise gear alignment, supports smooth torque transfer and can prevent accelerated wear of crownwheel, pinion and bearings. For G50 cars in particular, maintaining a healthy differential complements the robust gearbox design and contributes to a more predictable, refined drivetrain.

Fits

• Porsche 911 & 912 (1965–1989) – selected models with G50 gearbox
• Porsche 911 1987–1989 3.2L G50
• Porsche 911 1978–1989 3.3L Turbo (930) – applicable versions with G50 transmission

Related reference numbers
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99905906400

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