N400-FR | Dana N-400 Forward Rear Differential with Locking Power Divider | Remanufactured – Exchange Required

Dana N-400 Forward Rear Differential — Remanufactured by DPX

The Dana N-400 Forward Rear tandem differential is a proven performer in Class 8 International and Navistar trucks. Remanufactured in Mansfield, Ohio by Discount Parts Exchange - DPX. Each unit is completely disassembled, cleaned, thoroughly inspected, and rebuilt to your exact ratio using quality bearings, seals, and components. Verified for proper backlash, gear mesh, and seal integrity before leaving our shop.

Pairs with the Dana N-400 Rear-Rear differential to form a complete tandem set.

Highlights

• Model: Dana N-400 Forward Rear Tandem
• Application: International / Navistar Class 8 Trucks
• Axle Shaft Splines: 39 or 41 (verify before ordering)
• Power Divider: Integrated with air-actuated lock
• Ratio Range: 3.06 – 6.14 (see table below)
• Approx. Weight: ~475 lb
• Warranty: 12-month, unlimited mileage (parts-only)
• Applications: Over the road, dump truck, mixer, and heavy-haul fleets

Available Gear Ratios & Part Numbers (Dana N-400 Forward Rear)

Confirm ratio and spline count prior to ordering.

Casting & Assembly IDs

• Front Case: 401CB100
• Carrier Cap: 401CP100
• Rear Case: 401CF100
• Cap & Carrier (Main Case): 401CF108
• Finished Carrier Assembly: Dana 401CS104-X

What’s Included

• Complete remanufactured N-400 forward rear carrier rebuilt to your requested ratio by DPX
• Locking power divider (inter-axle lock) — air-engaged
• Painted & tagged for installation
• Tech support from DPX during install and initial run-in

Detroit Locker / No-Spin Options

Traction upgrades available for the N-400 forward rear. Verify spline size before ordering:

• 306S-98 — 2.00" (39-spline)
• 306S-100 — 2.100" (41-spline)

Core Exchange Policy

• Required: Like-for-like, complete, and rebuildable core
• Deductions may apply for: Cracked housings, burnt/missing internals, low-lube or water damage, or mismatched units
• Preparation: Core must be drained and palletized for pickup

Shipping

• Ships via LTL motor freight to verified commercial addresses only
• Forklift or dock required (liftgate available upon request)
• No residential delivery

Image Disclaimer

Photos show an actual Dana N-400 forward rear carrier from our inventory. Final appearance may vary by ratio, yoke, and casting revision.

Call to Order

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

DPX Drivetrain Tools Hub

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

Illustrated Parts List (IPL) Reference

For complete part-number listings and component diagrams, download the official Spicer® Drive Axles AXIP-4001 Illustrated Parts List covering the Dana N400 / N401 / N402 tandem drive axle family.
📄 Download Spicer N400 / N401 / N402 Illustrated Parts List (PDF)

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