Eaton RS404 Rear Differential Carrier Assembly – 3.55 Ratio, 41 Spline | Used

Looking for an affordable replacement carrier assembly for your Eaton rear differential? This used Eaton RS404 rear differential carrier assembly features a 3.55 gear ratio and 41-spline side gears and is a practical replacement option for compatible heavy-duty truck applications.

Removed from a 2000 Western Star 4900EX, this Eaton RS404 carrier assembly is ideal for truck owners, fleet operators, repair shops, rebuilders, and commercial truck parts buyers looking for a replacement differential component at a competitive price.

Product Details

• Manufacturer: Eaton
• Model: RS404
• Part: Rear Differential / Carrier Assembly
• Condition: Used
• Gear Ratio: 3.55
• Side Gear Splines: 41
• Locker: No
• Cast Number: 131812
• Yoke: 1710
• Donor Truck: 2000 Western Star 4900EX
• VIN: 2WKEDDJH3YK966103
• Warranty: 180-Day Limited Parts-Only Warranty

Eaton RS404 Carrier Assembly Replacement

The Eaton RS404 is a heavy-duty rear differential commonly found in commercial truck applications. When your differential carrier requires replacement, sourcing a used OEM Eaton assembly can be a cost-effective alternative to buying a new unit or rebuilding your existing carrier.

This Eaton RS404 carrier assembly comes with a 3.55 ratio and 41-spline side gears, making it important to verify these specifications against your existing differential before ordering.

Compatible Reference Numbers

This assembly is associated with the following reference information:

• Eaton RS404
• Eaton RS405
• Eaton RS454
• Eaton 21060S
• Eaton 22060S
• Cast # 131812
• Reference Cast # 127479
• Reference Cast # 127603
• Reference Cast # 129351
• Reference Cast # 129541
• Reference Cast # 130824

Reference numbers are provided for identification and should not be considered a guaranteed fitment list. Always compare your existing differential’s specifications, ratio, spline count, housing configuration, and other identifying numbers before purchasing.

3.55 Ratio – 41 Spline Carrier

If you need a 3.55 ratio Eaton rear differential carrier, this used RS404 assembly offers an affordable replacement solution. The 41-spline side gear configuration and 1710 yoke should be carefully matched to your truck’s existing drivetrain components.

The unit comes with a 180-day limited parts-only warranty, giving you additional protection when purchasing this used heavy-duty differential component.

Save on Your Heavy-Duty Differential Repair

Don’t spend more than necessary replacing your truck’s differential carrier. This used Eaton RS404 rear differential carrier assembly is available for just $585.00 and is ready to ship.

Order today and get the Eaton RS404 carrier assembly you need while this unit is available.

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