Mazda Rx7 FD 4.3 Cusco 1.5 way Rebuilt Rear Diff
Description
Mazda RX7 FD (FD3S) Rear Differential – 4.3 Ratio with Cusco 1.5 Way LSD Upgrade your Mazda RX7 FD (FD3S) with this fully rebuilt rear differential, featuring a brand new Cusco 1.5-Way LSD and aggressive 4.3 ratio gearing for improved acceleration and traction.
Built for street, drift, and track applications, this diff delivers sharper throttle response and stronger corner exit grip — perfect for rotary performance builds.
Specifications & Features: To Suit: Mazda RX7 FD (FD3S – “Batman” shape)
Ratio: 4.3:1
LSD: Brand New Cusco 1.5-Way Limited Slip Differential
Bearings: All new bearings fitted
Seals: Genuine Mazda seals
Upgrade: Solid pinion bearing spacer conversion (removes factory crush sleeve weakness)
Rear Cover: Vapour blasted OEM housing
Hardware: Gold zinc plated bolts
Why 4.3 Ratio? The 4.3 gearing provides:
Quicker acceleration
Improved throttle response
Stronger pull through the gears
Ideal pairing for turbo rotary setups
Perfect for drift builds, street performance cars, or anyone wanting more aggressive gearing from their FD.
Why Choose Cusco 1.5 Way? The Cusco 1.5-way LSD provides strong lock under acceleration while remaining smoother under deceleration compared to a 2-way setup. This makes it ideal for:
Street & weekend cars
Drift setups
Grip / circuit builds
High horsepower 13B turbo builds
Professionally Rebuilt & Ready to Install This differential has been carefully assembled and set up with correct preload and backlash for reliability and long service life.
Built to handle serious power and hard driving.