Ford Performance M-4204-MB Torsen Differential

8.8 in. w/31 Spline - 2.7 Drive Bias Ratio - Does Not Fit IRS Applications Biased Ratio Locking Differential Ford Performance Parts - Torsen Differential P/N M-4204-MB: These Ford Racing Torsen differentials use a worm gear friction system that will not wear out like conventional clutch-type positive traction differentials. These differentials ensure your engine's power is transferred to the wheels with the maximum traction. The unique torque-sensing ability of the Torsen design, and the smooth engagement of Torsen-style limed slip differentials, make them the perfect choice for your street, strip, or off-road vehicle.