DS402 | DS381 Front (Forward) Differential | Eaton Dana-Spicer | Class 8 Trucks | DPX Reman

DS402 | DS381 | Eaton Dana-Spicer Forward Differential — Remanufactured by DPX (40K GAWR)

Heavy-duty forward tandem differential, single reduction with power divider, commonly used in Class 8 trucks. Also known as DS381. Remanufactured in Mansfield, Ohio by Discount Parts Exchange - DPX. Each unit is completely disassembled, cleaned, inspected, and rebuilt to your exact ratio using high-quality OEM and aftermarket components.

Call DPX to confirm: 419-522-3320.

Highlights

• Model: DS402 / DS381 (Forward Differential with Power Divider)
• Axle Family: Eaton Dana-Spicer DS341, 402, 402-P, 451-P
• GAWR: 40,000 lb
• Approx. Weight: 450 lb
• Design: Single-reduction with integrated power divider
• Input Shaft: 115122 – 2.250" 44 spline
• Axle Gears: 110527 – 2.100" 41 spline
• Input Nut: 95207 (old generation) or 128049 (later generation) – 55mm socket, torque 840-1020 lb-ft
• Input Seal: 127719
• Output Seal: 127720
• Output Nut: 95205 (old) or 127589 (new) – 55mm socket, torque 575-703 lb-ft
• Carrier Castings: 128107, 110814
• Power Divider Casting: 45481
• Applications: Over the road, line-haul, and heavy-duty Class 8 trucks

Available Gear Ratios & Gearset Part Numbers (Post 4-6-89)

*16" gearing • Recommended lubricant: Spicer FE 75W-90 synthetic gear oil (or equivalent meeting Dana specifications)

What’s Included

• Remanufactured DS402 / DS381 forward differential rebuilt to your requested ratio by DPX
• 12-month, unlimited-mileage parts-only warranty
• Tech support from DPX during install and initial run-in

Fitment Notes

• Common in Eaton Dana-Spicer forward axle applications on Class 8 trucks
• Special Notation: Early International trucks used a reverse air system for the power divider
• Verify ratio, spline count, and generation (old vs later) before ordering

Image Disclaimer

Photos are representative; final appearance may vary by ratio and casting revision.

Call to Order

Call Discount Parts Exchange - DPX for pricing and availability: 419-522-3320

DPX Drivetrain Tools Hub

Free tools built by rebuilders for truckers and fleets — Road Speed & Ratio Calculator, PTO shimming procedure, gear ratio comparison charts, and our full IPL library for instant parts identification.
Open DPX Drivetrain Tools Hub →

DPX — Ohio’s Premier Heavy-Duty Drivetrain Rebuilder | Built to Perform. Trusted to Last.