RR20-145 | Meritor Rear-Rear Differential — Remanufactured by DPE (40K GAWR)
Heavy-duty rear-rear tandem differential for Class 8 tractors. Remanufactured in Mansfield, Ohio by DPE. The Meritor RR20-145 mounts in the rear-most axle position and is driven by the power divider in the forward rear (RD20-145). Built for long service life and reliable torque delivery. Also referenced as RR20145 (no dash).
Pairs with the RD20-145 Meritor forward rear differential to form a complete tandem set.
Summary
Professionally remanufactured RR20-145 carrier with matched gearset. No power divider (rear position unit). Thoroughly inspected for proper gear mesh and backlash. Sold on exchange.
Highlights
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Model: RR20-145 (rear-rear tandem differential; no power divider)
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Axle Family: Meritor/Rockwell 20-145
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GAWR: 40,000 lb
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Design: Single-reduction; matched ring & pinion
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Position: Rear-rear (driven via inter-axle shaft from RD20-145)
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Casting Numbers: 3200K1675, 3200R1864, 3200Q1499
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Applications: Kenworth, Peterbilt, International, Freightliner (fitment varies)
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Dry Weight: ~280 lb
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Warranty: 12-month, unlimited mileage (parts-only)
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Interchange: RR20-145 / RR20145 / Rockwell-Meritor rear-rear carrier
Available Gear Ratios & Meritor Part Numbers
| Ratio |
Meritor P/N |
| 2.64 |
B41718-1 |
| 2.79 |
A41676-1 |
| 2.93 |
A41104-1 |
| 3.07 |
A41508-1 |
| 3.21 |
A41510-1 |
| 3.42 |
B41276-1 |
| 3.58 |
B41512-1 |
| 3.73 |
B41514-1 |
| 3.90 |
B41678-1 |
| 4.11 |
B41680-1 |
| 4.30 |
B41278-1 |
| 4.33 |
B41278-1 |
| 4.56 |
B41562-1 |
| 4.63 |
B41280-1 |
| 4.88 |
B41282-1 |
| 5.29 |
B41284-1 |
| 5.86 |
B41466-1 |
| 6.14 |
A41468-1 |
| 6.43 |
A41470-1 |
| 6.83 |
A41472-1 |
| 7.17 |
A41474-1 |
Note: Availability varies. Call to confirm current ratios.
Reference Documentation
For detailed diagrams, part numbers, and service data, download the official
Meritor RD20-145 / RR20-145 Illustrated Parts List (PF-9147).
📄 Download RD20-145 Illustrated Parts List (PDF)
For overhaul, inspection, and setup procedures covering multiple Meritor axle families, see the
Meritor Maintenance Manual 5L – Axle Service Guide.
📘 Download Meritor Maintenance Manual 5L (PDF)
What’s Included
- Remanufactured Meritor RR20-145 rear-rear carrier assembly (set to your requested ratio)
- 12-month parts-only warranty (unlimited mileage)
Fitment Notes
- Fits tandem-drive trucks equipped with the Meritor/Rockwell 20-145 axle family
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Rear-rear position; pairs with RD20-145 (forward/power-divider) carrier
Image Disclaimer
Photos are representative; final appearance may vary by ratio and casting revision.
Warranty Policy
Warranty: 12-month parts-only; unlimited mileage; no labor.
Core Exchange: Like-for-like, complete, rebuildable core required within 30 days. Core must be drained and palletized for pickup. Deductions may apply for cracked housings, missing/burnt internals, low-lube/water damage, or non-matching cores.
Location
Location: Mansfield, Ohio
Call for pricing and availability: 419-522-3320.
Heavy-Duty Solutions | Built to Perform. Trusted to Last.
