Vehicle Fitment

• 1986–2014 Ford (Bronco, Mustang, F‑150, Explorer, Expedition, etc.) with Rear 8.8‑inch 31‑spline C‑Clip axle
• 1983–2014 Lincoln / Mercury rear 8.8‑inch 31‑spline axles

Fitment Notes

• Axle must be Ford 8.8‑inch, rear, with 31‑spline C‑Clip axle shafts
• Axle shaft diameter ~1.32 in
• All gear ratios supported, but **4.56 & numerically higher** require relief grinding on ring gear tooth crown for proper install 
• C‑Clip retention style—not compatible where non‑C‑Clip axle design is used

Features

• 100% automatic locking (Detroit Locker) for both wheels — even with one loss of traction
• Provides strong durability and proven Eaton design for off‑road, work, towing, restoration
• Steel carrier with heavy‑duty internals ready for high torque situations
• Works forward & reverse under load for maximum grip
• Compatible with all gear ratios, allowing custom gearing options
• Relief grinding option for higher numeric ratios to ensure proper clearance
• Minimal maintenance locker design — no driver interaction needed
• High strength and performance under severe conditions (mud, trail, snow, etc.)

Specifications

• Part Number: 187C145A
• Differential Type: Detroit Locker (fully automatic lock)
• Axle Type: Ford 8.8‑inch, C‑Clip rear
• Spline Count: 31 splines
• Axle Shaft Diameter: ~1.32 inches
• Ring Gear Size: 8.8 inches
• Gear Ratio: All; **4.56 & up** require ring gear relief machining 
• Cover Bolt Count: 10 (standard Ford 8.8 rear cover) 

Included Components

• 1× Eaton 187C145A Detroit Locker Differential Carrier
• Installation Instructions

Product Description

The Eaton 187C145A Detroit Locker is built to deliver maximum rear axle traction for Ford‑Lincoln vehicles with the 8.8‑inch, 31‑spline C‑Clip rear end. Under driving conditions where one wheel starts to lose grip, the Detroit Locker automatically locks both wheels solid—ensuring torque is sent to both rear wheels for superior trail, mud, towing, and performance driving benefits. When turning or differential wheel speed is required, it unlocks automatically to allow smooth and safe operation.

Supporting all gearing options, this locker offers excellent flexibility. If your build or driving needs call for higher numeric gear ratios (4.56 or above), note that installation will require relief grinding on the ring gear tooth crown to clear the locker internals. Otherwise, with standard gear ratios, installation is straightforward. Whether restoring an 80’s Bronco, upgrading Mustang grip, or setting up a 4×4 F‑150 for off‑road and towing, the 187C145A is a premium choice in the Detroit Locker lineup.