RD20-145 | Meritor Forward Rear Differential with Power Divider — Remanufactured by DPX (40K GAWR)
Heavy-duty forward-rear tandem differential with integrated power divider for Class 8 tractors. Remanufactured in Mansfield, Ohio by Discount Parts Exchange - DPX. The Meritor RD20-145 is the forward position unit that feeds the rear axle through the inter-axle shaft. Rebuilt to your exact ratio for dependable traction on highway and vocational routes. Also referenced as RD20145 (no dash).
Pairs with the RR20-145 Meritor rear-rear differential to form a complete tandem set.
Highlights
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Model: RD20-145 (forward rear with 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; integrated power divider with truck-controlled lock
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Position: Forward-rear (drives rear axle via inter-axle shaft)
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Casting Numbers: 3200F1644, 3200K1623, 3200Q1889
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Dry Weight: ~441 lb
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Warranty: 12-month, unlimited mileage (parts-only)
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Interchange: RD20-145 / RD20145 / Rockwell-Meritor forward rear power divider
Available Gear Ratios & Meritor Part Numbers (RD20-145 Forward Rear)
| 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 |
What’s Included
- Remanufactured Meritor RD20-145 forward-rear carrier assembly (rebuilt to your requested ratio) by Discount Parts Exchange - DPX
- 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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Forward-rear position with power divider; pairs with RR20-145 (rear-rear 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
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 detailed diagrams, part numbers, and service data, download the official Meritor RD20-145 / RR20-145 Illustrated Parts List (PF-9147).
📄 Download RD20-145 / RR20-145 Illustrated Parts List (PDF)
Includes exploded-view diagrams, part numbers, and component identification for Meritor 20-145 series axles.
DPX — Ohio’s Premier Heavy-Duty Drivetrain Rebuilder | Built to Perform. Trusted to Last.
