Eaton 225S10 Detroit Locker Differential GM 10.5\" 14-Bolt 30-Spline All Ratios For Sale - New and Used

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- AUTHENTICPART

Part Brand: Eaton

Part Number: 225S10

Vehicle Fitment

• 1972–2012 General Motors ¾‑Ton and 1‑Ton Trucks/Vans with 14‑Bolt 10.5″ Full‑Float Rear Axles
• Chevrolet C/K 2500 / 3500 / Silverado 2500/3500 HD
• GMC Sierra 2500 / 3500, GMC/Chevy Suburban and Van 2500/3500 full‑float rear

Fitment Notes

• Fits only GM 14‑bolt full‑floating 10.5″ rear axle housing
• Requires 30‑spline axle shafts, 1.50″ diameter
• Works with all gear ratios (“All Ratios”) for ring gear = 10.5″
• Replaces conventional (non‑locking) differential internals only -- carrier housing remains OEM
• Removal of thrust washers required during locking “Detroit Locker” design for maximum traction under load
• No clutch packs requiring maintenance -- built rugged for longevity
• Fully mechanical; unlocks when wheel speeds are different during turning
• Steel construction matching Eaton quality standards & Eaton’s GM 14‑bolt 10.5\" rear axle spec
• Compatible with existing open diff case without replacing the housing
• All gear ratio compatibility simplifies builds and reduces need to source specific ratios
• Great for off‑road, towing, work use, or street‑muscle style trucks
• OEM spindle and u‑joint compatibility Number: 225S10
• Differential Type: Locking (“Detroit Locker”)
• Ring Gear Size: 10.5″ (GM 14‑Bolt)
• Spline Count: 30 splines; Axle Shaft Diameter: 1.50″
• All gear ratios supported (“All Ratios”) for this axle size
• Position: Rear Differential / Carrier Internals Replacement only
• Cover Bolts: 14‑Bolt Rear Cover (GM 14‑Bolt)

Included Components

• 1x Eaton 225S10 Detroit Locker differential internals
• Installation instructions

Product Description

The Eaton 225S10 Detroit Locker is a high‑performance locking differential designed for GM 14‑Bolt 10.5″ full‑floating rear axles. Instead of replacing the full housing, it replaces the internal spider/open differential components--ideal for builders who want traction without changing axle housing. It delivers 100% torque to both wheels under load yet allows differential action during turning for smooth everyday driving.

Engineered with 30‑spline 1.50″ diameter shafts, steel internals, and compatibility with “all gear ratios,” the 225S10 is versatile for a wide range of GM trucks and vans from 1972‑2012. Whether you\'re upgrading a work truck, off‑road rig, or street cruiser, this locker delivers durability and traction you can count on.

Important installation notes: requires removal of thrust washers; must be full float rear axle housing; confirm your axle is a GM 14‑Bolt 10.5″ with 30‑spline, 1.50″ shafts before purchasing. Fitment verified through 2012. 2013‑2025 unconfirmed for some models; check with your axle tag or service manual.

*Parts are for USA spec vehicles, please contact us to verify fitment on JDM & international models.

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• Canada customers - If does not collect import & duty fees during checkout, the shipping carrier will collect them prior to delivery.

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• Any returns received installed, mounted, used or missing components will be subject to return fee\'s.

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