DESCRIPTION DESCRIPTION: Eaton Detroit Truetrac differentials use a patented design of parallel-axis planetary helix gears to provide a quiet, automatic splitting of torque. They perform like a limited-slip differential under normal driving conditions, automatically transferring torque to the wheel with better traction when ground conditions warrant. FEATURES FEATURES: F150 8.8" Eaton Detroit TrueTrac Rear Differential Features: Greatly improves rear-end traction and handling Limited Slip design distributes power to both wheels evenly Extremely fast engagement Drop-in replacement for stock differential Beneficial for off-road environments For F150s with 34-spline 8.8" C-clip rear-ends only Designed to work with gear ratios 3.31 & Up FITMENT VEHICLE FITMENT: 2015-2023 Ford F150 with the 8.8" rear end Specifications: Axle Model: Ford 8.8" C-Clip Ring Gear Diameter: 8.8" Axle Shaft Diameter: 1.36" Spline: 34 Gear Ratio: 3.31 & Up - Will not fit 3.15 gearing