Rear Differential - Final Drive - Various Ratios - Weir Performance - GR86, GT86 & BRZ, JZX90 & JZX100

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  • Regular price £528.00 (Ex-vat : £440.00)

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Crown Wheel & Pinion Set for GR86, GT86 & BRZ

Weir final drive gears are CNC machined and lapped for quiet operation!

The high quality ring and pinion gear set is shot peened, a process which further strengthens the gears and adds durability.

 As a result, we are proud to offer enthusiasts the best final drive gears on the market today.

What is a final drive gear set?

The final drive ratio is the final gearing between your transmission and the driven wheels. By changing it, you can affect the performance of your car.

A lower number final drive ratio will lead to less torque at the wheels but a higher top speed.

A higher number offers more torque at the wheels, closes the gear ratios, and a lower top speed.

The standard ration for a GT86 & BRZ is 4.1

By changing your final gear ratios, you can optimise the car for different applications.

eg: 1, GT86 but want more acceleration and closer gear ratios to keep the engine in the correct rev band - use a 4.30, 4.56 or 4.88.

eg: 2 GT86 automatic cars from the factory have very high gear ratios, 4th in the auto is the same ratio as 5th in the manual car. Use a 4.56 or 4.88 to improve acceleration.

eg: 3, Forest rallying requires close ratios and usually only a low top speed - use a 4.88 or 5.30.

eg: 4, cars using a gearbox conversion where a lower ratio is required - use a 3.58.

Note: You will also need to replace the following parts when installing the final drive. These can be found in the Drivetrain section.


  • Black Friday 23
  • GR86
  • GR86 2020 on
  • Subaru BRZ 2012 On
  • Subaru BRZ 2017 On BRZ
  • Toyota GT86 2012 to 2016
  • Toyota GT86 2017 On
  • Toyota JZX100 2.5 Turbo 09/96> 06/01
  • Toyota JZX90 2.5 Twin Turbo 10/92> 08/96
- You will also need to replace the following parts when installing the final drive. These can be found in the Drivetrain section. - GT86 Rear Drive Pinion Nut - GT86 Rear Diff Front Oil Seal - GT86 Rear Diff Crush Tube