The Eaton Detroit Locker NoSPIN Differential (Part #225S10) is a legendary, fully automatic locking differential engineered for GM 10.5-inch (14-bolt) rear axles with 30-spline shafts. Designed for maximum traction in the toughest environments, the Detroit Locker delivers 100% torque to both wheels when needed, automatically unlocking during turns to maintain street drivability.

Ideal for heavy-duty trucks, off-road rigs, and work vehicles, the NoSPIN’s mechanical locking system provides unmatched strength, dependability, and simplicity—making it a top choice for those who demand the ultimate in traction and durability.

Note: The 225S10 replaces conventional (non-locking) differential internals only. Thrust washers must be removed during installation.

Features:

• Fully automatic mechanical locking differential for maximum traction

• Provides 100% torque transfer to both wheels when locked

• Automatically unlocks during cornering for smooth operation

• Designed for GM 10.5" (14-bolt) axles with 30-spline shafts

• Ideal for off-road, towing, and high-load applications

• Replaces conventional differential internals—no case replacement required

• Proven Detroit Locker durability for long service life

Specifications:

Fitment:
Built for GM 10.5-inch (14-bolt) rear axles, found in a wide range of heavy-duty General Motors vehicles:

• 1972–2012: GM ¾-Ton Trucks – Rear 14-Bolt (4.10 & Down / 4.56 & Up)

• 1973–2012: GM 1-Ton Trucks, Vans, Cab & Chassis, Motorhomes, and Buses – Rear 14-Bolt (All Ratios)

Ideal Usage:

• Off-Road: Rock Crawl, Light Trail, Sand Sports, Extreme Off-Road, Work Truck / Towing

• On Road: Street & Muscle, Drag Racing, Restoration, Work Truck / Towing

This Part Fits: