RS404 | Eaton / Dana-Spicer Rear-Rear Differential — Remanufactured by DPE (40K GAWR)
The RS404 rear-rear tandem axle differential for Class 8 trucks is built for dependable torque delivery and long service life at 40,000 lb GAWR. Remanufactured in Mansfield, Ohio by DPE with matched hypoid gearing and verified setup for gear pattern, backlash, and bearing preload. Also referenced as RS-404 or RS404-RR.
Pairs with the DS404 forward (front) differential to form a complete tandem set.
Summary
Professionally remanufactured RS404 rear-rear carrier with matched ring & pinion. Inspected for proper gear mesh, backlash, and bearing preload. Sold on exchange.
Specs & Features
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Position: Rear-rear (tandem)
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GAWR: 40,000 lb
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Ring Gear: Hypoid, 15.4–15.7″ OD (15.5″ nominal)
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Axle Shaft Splines: 41
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Pinion Spline: 39 (1.95″ involute)
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Pinion Nut P/N: 127589
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Side Gear P/N: 127368
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Axle Housing Fastener Kit P/N: 512087
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Weight: ≈318 lb
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Inspection Scope: Gear pattern, backlash & bearing preload verified
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Recommended Lubricant: Spicer FE 75W-90 synthetic (meets Dana SHAES 256 Rev E, Dana SHAES 429, API GL-5 & MT-1, SAE J2360, Detroit DFS93K219.01, Mack GO-J Plus, Meritor O76-N, Navistar MPAPS B-6821)
Available Gear Ratios & Part Numbers
Original kit numbers shown in parentheses where applicable.
| Ratio |
Kit P/N |
Ring Gear P/N (teeth) |
Pinion P/N (teeth) |
| 2.64 |
211478 |
127380 (37) |
127420 (14) |
| 2.85 |
211479 |
127381 (37) |
127421 (10) |
| 2.93 |
509424 |
129534 (41) |
129533 (14) |
| 3.08 |
513373 (211480) |
127381 (37) |
139737 (12) |
| 3.25 |
513372 (211481) |
127382 (39) |
130127 (12) |
| 3.36 |
513371 (211482) |
127381 (37) |
130128 (11) |
| 3.42 |
504055 |
134325 (41) |
134326 (12) |
| 3.55* |
513370 (211483) |
127382 (39) |
130129 (11) |
| 3.70 |
513369 (211484) |
127381 (37) |
130130 (10) |
| 3.90 |
513368 (211485) |
127382 (39) |
130131 (10) |
| 4.11* |
513367 (211486) |
127381 (37) |
130132 (9) |
| 4.33 |
513366 (211487) |
130200 (39) |
130133 (9) |
| 4.63 |
513365 (211488) |
130194 (37) |
129748 (8) |
| 4.88 |
513364 (211489) |
130195 (39) |
129750 (8) |
| 5.29 |
513363 (211490) |
130194 (37) |
129818 (7) |
| 5.57 |
513362 (211491) |
130195 (39) |
129822 (7) |
| 6.17 |
513361 (211492) |
127383 (37) |
129844 (6) |
| 6.50 |
211493 |
127384 (39) |
127435 (6) |
| 7.17 |
211494 |
127385 (43) |
127436 (6) |
*Field-favorite linehaul ratios.
Note: Availability varies. Please call to confirm ratio before ordering.
Reference Documentation
For detailed exploded-view diagrams, part numbers, and service data, download the official Spicer® Drive Axles AXIP-0200-32020 Illustrated Parts List covering the DS/RS404 / D404 / D405 / D454 axle family.
📄 Download Spicer DS404 / D404 Illustrated Parts List (PDF)
Includes carrier assembly diagrams, ring and pinion part numbers, and differential component identification for DS404-series axles.
What’s Included
- Remanufactured RS404 rear-rear carrier assembly (set to your requested ratio)
- 12-month, unlimited-mileage parts-only warranty
- DPE tech support during install and initial run-in
Core Exchange Policy
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Required: Like-for-like, complete, rebuildable core
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Deductions may apply for: Cracked housings; burnt/missing internals; low-lube or water damage; non-matching cores
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Preparation: Core must be drained and palletized for pickup
Shipping Policy
- Ships via LTL motor freight to verified commercial addresses only
- No residential delivery — forklift or dock required at delivery
Image Disclaimer
Photos show a representative RS404 unit; final appearance may vary by ratio and casting.
Warranty
DPE warrants this product against defects in materials and workmanship for 12 months from the date of shipment (parts only; no labor).
Location & Contact
Location: Mansfield, Ohio
Call for pricing and ratio availability: 419-522-3320
Heavy-Duty Solutions — Built to Perform. Trusted to Last.
