Mazda RX7 FC Rebuilt Rear Differential 4.1 Ratio Open

$2,495.00 NZD

Mazda RX7 FC Rear Differential – 4.1 Ratio Open Differential

Suits: Mazda RX7 FC (FC3S)
Ratio: 4.1:1
Carrier Type: Open Differential
Upgrade: Solid Pinion Bearing Spacer

Get your RX7 FC back on the road with this fully rebuilt 4.1 ratio rear differential, ideal as a reliable OEM-style replacement or for street-driven rotary builds.

This unit has been professionally rebuilt with all new bearings and seals, ensuring smooth operation, reduced noise, and long-term durability.


Key Features:

Complete Rebuild:
Fully stripped, inspected, and rebuilt using all new high-quality bearings and new seals for dependable performance.

4.1 Ratio Gearing:
Factory-style gearing offering a great balance of acceleration and drivability for street and daily use.

Open Differential:
Smooth and predictable operation, ideal for standard road use and drivers wanting factory-like handling characteristics.

Solid Pinion Bearing Spacer Upgrade:
Replaces the factory crush sleeve for improved strength, consistent preload, and increased long-term reliability.


Professionally assembled and set up with correct preload and backlash, making it a dependable, bolt-in solution for Mazda RX7 FC owners looking for a quality rebuilt differential.

  • Personalised Service
  • Better by Design
  • Worldwide shipping
  • Regional suppliers