Dana N-400 Forward Rear Differential — Remanufactured by DPX
The Dana N-400 Forward Rear tandem differential is a heavy-duty carrier typically found in International / Navistar Class 8 trucks. Every unit is completely torn down, cleaned, inspected, and rebuilt to your exact ratio with new bearings, seals, and critical wear components. Features an integrated air-actuated power divider lock. Available with standard open differential or Detroit Locker (NoSPIN). Remanufactured in Mansfield, Ohio by Discount Parts Exchange - DPX.
Pairs with the Dana N-400 Rear-Rear differential to form a complete tandem set.
Call DPX to confirm: 419-522-3320.
Highlights
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Model: Dana N-400 Forward Rear Tandem — also known as N210 (41-spline), N190 (39-spline), and N175 (36-spline) in single-axle applications
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Typically Found In: International / Navistar Class 8 trucks
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Axle Shaft Splines: 39 or 41 (verify before ordering)
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Power Divider: Integrated with air-actuated lock
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Ratio Range: 3.06 – 6.14
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Detroit Locker (NoSPIN) Options:
- 306S-99 — 39 spline
- 306S-100 — 41 spline
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Approx. Weight: ≈475 lb
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Condition: Remanufactured exchange (like-for-like core required)
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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.
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 |
How to Calculate Gear Ratio: Divide the number of teeth on the ring gear by the number of teeth on the pinion gear. This is the standard method used by Dana Spicer.
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
Recommended Lubricant
Use Dana FE 75W-90 Fuel-Efficient Synthetic Gear Lubricant (GL-5) or equivalent approved synthetic. Do not use conventional gear oil.
What’s Included
- Complete remanufactured Dana N-400 Forward Rear carrier rebuilt to your requested ratio by Discount Parts Exchange - DPX
- Integrated air-actuated power divider lock
- Available with standard open differential or Detroit Locker (NoSPIN)
- Painted and tagged for installation
- 12-month unlimited-mileage parts-only warranty
- Tech support from DPX during installation and initial run-in
Core Exchange Policy
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Required: Like-for-like, complete, and rebuildable core
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Deductions may apply for: Cracked housings, burnt or missing internals, low-lube or water damage, or mismatched units
- Call for core return instructions
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, locker configuration, and casting revision.
Call to Order
Call Discount Parts Exchange - DPX for pricing and ratio availability: 419-522-3320
DPX Drivetrain Tools Hub
Free tools built by rebuilders for mechanics, drivers, and fleets:
Road Speed Calculator •
Gear Ratio Charts •
PTO Shimming Guide •
Full IPL Library →
Reference Documentation
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.
