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

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.

• GT86 Rear Drive Pinion Nut
• GT86 Rear Diff Front Oil Seal
• GT86 Rear Diff Crush Tube