• RR20-145 Meritor rear rear tandem axle differential | remanufactured by DPE | rear housing view
  • RR20-145 Meritor differential | 20-145 series rear rear axle | remanufactured by Discount Parts Exchange | side profile view
  • RR20-145 Meritor rear rear differential casting numbers | 3200K1675 3200R1864 3200Q1499 | remanufactured 20-145 series unit
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RR20-145

Quote Only, Call For Price - 419-522-3320

RR20-145 | Meritor Rear Rear Differential | Tandem Axle | DPX Reman

RR20-145 | Meritor Rear Rear Differential | Tandem Axle | DPX Reman

RR20-145 | Meritor Rear Rear Differential — Remanufactured by DPX (40K GAWR)

Heavy-duty rear-rear tandem differential for Class 8 trucks. Remanufactured in Mansfield, Ohio by Discount Parts Exchange - DPX. The Meritor RR20-145 is the rear position unit that pairs with MD20-145 / RD20-145 forward carriers. Rebuilt to your exact ratio with upgraded components. Popular in Cummins-Meritor drivetrain applications.

Call DPX to confirm: 419-522-3320.

Highlights

  • Model: RR20-145 (rear rear)
  • Axle Family: Meritor / Rockwell 20-145 (Cummins-Meritor)
  • GAWR: 40,000 lb
  • Design: Single-reduction; matched ring & pinion
  • Pinion: 2.00" - 39 spline
  • Axle Gears: 2234-G-1437 – 2.100" 41 spline
  • Carrier Castings: 3200K1675, 3200R1864, 3200Q1499
  • Position: Rear-rear (mates with RD20-145 forward rear)
  • Applications: Over the road, dump truck, heavy haul, and Cummins-powered fleets

Available Gear Ratios & Gearset Part Numbers

RR20-145 Rear Rear Ratios
Ratio Gearset Part Number
2.80 A41490-1
2.93 A41158-1
3.07 A41494-1
3.21 A41496-1
3.42 B41164-1
3.58 B41498-1
3.73 B41500-1
3.91 B41502-1
4.10 B41504-1
4.30 A40066-1
4.33 B41266-1
4.56 B41542-1
4.63 B41268-1
4.88 B41270-1
5.13 A41272-1
5.29 B41274-1
5.57 A41304-1
5.86 B41456-1
6.14 A41458-1
6.43 A41460-1
6.83 A41462-1
7.17 A41464-1

What’s Included

  • Remanufactured Meritor RR20-145 rear rear carrier assembly rebuilt to your requested ratio by DPX
  • 12-month, unlimited-mileage parts-only warranty
  • Tech support from DPX during install and initial run-in

Fitment Notes

  • Fits tandem-drive trucks equipped with the Meritor / Rockwell 20-145 axle family (Cummins-Meritor applications)
  • Rear-rear position; pairs with MD20-145 / RD20-145 forward rear
  • Verify ratio and spline count before ordering

Image Disclaimer

Photos are representative; final appearance may vary by ratio and casting revision.

Call to Order

Call Discount Parts Exchange - DPX for pricing and availability: 419-522-3320

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THE REMAN CENTER. INC. dba Discount Parts Exchange

🔧 Why Choose Discount Parts Exchange?

A trusted drivetrain partner since 1997

✅ Quality Gearing

We source only high-quality OEM and aftermarket parts—dependable and built to perform.

⚡ Great Service

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