Dana N-400 Forward Rear Differential — Remanufactured by DPX
The Dana N-400 forward rear (tandem) carrier is remanufactured for Class 8 International/Navistar trucks. Each carrier is disassembled, cleaned, inspected, and rebuilt to your exact ratio using OEM and premium aftermarket components. Units are verified for backlash, gear mesh, and seal integrity. Remanufactured in Mansfield, Ohio by Discount Parts Exchange - DPX.
Call DPX to confirm: 419-522-3320.
Quick Specs
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Model: Dana N-400 (Forward Rear Tandem)
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Application: International / Navistar (Class 8)
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Axle Shaft Splines: 39 or 41 (verify before ordering)
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Ratio Options: 3.06 – 6.14 (see table)
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Approx. Weight: ~475 lb
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Core Required: Like-for-like rebuildable
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Common OE Codes: International 514-GDCF / Code 14GDC
Why Choose DPX
- Rebuilt to your exact ratio — backlash, mesh, and seals triple-checked
- Bulletproof for line-haul and heavy-haul work
- Drop-in ready — painted, tagged, no surprises
- Real tech support — we answer the phone when you’re under the truck
Gear Ratio Options & Part Numbers (Dana N-400 Forward Rear)
Confirm ratio and spline count prior to ordering.
Dana N-400 Forward Rear Gearsets
| Ratio |
International Gear Set P/N |
Dana Gear Set P/N |
| 3.06 |
1665335C91 |
401KG100-X |
| 3.21 |
1665336C91 |
401KG101-X |
| 3.42 |
1665337C91 |
401KG102-X |
| 3.54 |
1665338C91 |
401KG103-X |
| 3.73 |
1665339C91 |
401KG104-X |
| 3.91 |
1665340C91 |
401KG105-X |
| 4.10 |
1665341C91 |
401KG106-X |
| 4.44 |
1665342C91 |
401KG107-X |
| 4.78 |
1665344C91 |
401KG109-X |
| 5.11 |
1665346C91 |
401KG128-X |
| 5.38 |
1665348C91 |
401KG112-X |
| 5.63 |
1665349C91 |
401KG135-X |
| 6.14 |
1665350C91 |
401KG126-X |
Casting & Assembly IDs
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Front Case: 401CB100
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Carrier Cap: 401CP100
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Rear Case: 401CF100
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Cap & Carrier (Main Case): 401CF108
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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 & initial run-in
Detroit Locker / No-Spin Options
Traction upgrades available for the N-400 forward rear. Verify spline size before ordering:
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306S-98 — 2.00" (39-spline)
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306S-100 — 2.100" (41-spline)
Core Exchange Policy
- Core required: like-for-like, complete, and rebuildable
- Possible deductions for cracked housings, burnt/missing internals, water or low-lube damage, or mismatched units
- Call for pickup return instructions
Shipping
- LTL freight to commercial address with dock/forklift
- Residential and liftgate service available by request
Image Disclaimer
Photos show an actual Dana 170-series locker carrier from our inventory. Final appearance may vary by ratio, yoke, and casting revision.
Order & Availability
Call DPX for price and ratio availability: 419-522-3320
Curious What a Ratio Change Will Do for Your Truck?
Use our free Road Speed Calculator to plug in your tire size, current ratio, and target speed/RPM. See exactly what a 3.55, 3.73, or 4.10 would do before you buy.
Open Road Speed Calculator →
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)
Includes carrier-assembly diagrams, ring-and-pinion data, and differential component identification for Spicer N400-series axles.
DPX — Ohio’s Premier Heavy-Duty Drivetrain Rebuilder | Built to Perform. Trusted to Last.
