Ford Racing M-4204-M Traction-Lok Differential for 15-26 Mustang

Vehicle Fitment

• 2015-2026 Ford Mustang (all trims including EcoBoost, GT, Mach 1, Bullitt, Shelby GT350/GT350R, Shelby GT500; 8.8" IRS rear)

Features

• Factory-style Traction-Lok limited slip differential
• Designed for the Ford Performance Super 8.8" rear end
• Compatible with 34-spline axle shafts
• Improves traction by biasing torque between rear wheels
• Clutch-type limited-slip design for street and track use
• Accepts anti-lock brake exciter ring on most Mustang IRS setups
• Direct replacement for open-differential carriers
• Optimizes acceleration and handling under power

Specifications

• Part Number: M-4204-M
• Type: 8.8" Traction-Lok limited slip differential
• Axle Spline Count: 34
• Compatibility: Mustang IRS rear end with 3.31, 3.55, 3.73 or 4.09 ratio gears
• Requires friction modifier with initial fill (~4 oz)
• Installation Kit: Differential install kit M-4210-B3 (sold separately)
• Position: Rear differential carrier

Included Components

• 1x Traction-Lok limited slip differential unit

Product Description

The **Ford Performance M-4204-M 8.8" Traction-Lok Limited Slip Differential** is a premium rear differential upgrade engineered for **2015-2026 Mustang** models with the 8.8" independent rear suspension. This traction-oriented differential replaces an open carrier and uses a clutch-type limited-slip design to distribute torque more effectively between rear wheels, helping improve grip during launches, cornering, and spirited driving. The Traction-Lok unit accommodates 34-spline axles and is designed to work with Ford Performance 8.8" gear sets in ratios such as 3.31, 3.55, 3.73, and 4.09.

This Differential is ideal for enthusiasts looking to enhance acceleration and handling without extensive modifications. It accepts the anti-lock brake exciter ring found on most Mustang IRS rear ends and requires the use of a friction modifier during initial fill for proper clutch pack operation. Installation typically calls for a differential install kit (M-4210-B3) sold separately. With solid traction biasing and OEM-level quality, the M-4204-M unit provides improved rear wheel grip whether on the street or at the strip.