The Meritor A39878-1 or A398781 is a genuine OEM service gear set for RDXX160 and RPXX160 drive axles. It carries a 4.10 final drive ratio, with a 10-tooth pinion (pinion part number 39883) and a 41-tooth ring gear. This ring-and-pinion set is the correct replacement for restoring proper drive axle ratio on those axle models. Call us to confirm this gear set matches your axle model and ratio before ordering.
Interchanges:
- 1119438
- 1670235C91
- 81170657
- 8235A398781
- 9631A398781
- A398781410S
- A398781RI
- ATIA398781
- E9HZ4309T
- ER72460
- ERA398781
- HRA398781
- SASA398781
- SD485
- TDAA398781
Features
Genuine Meritor OEM service gear set, part number A39878-1 or A398781
4.10 final drive ratio
10-tooth pinion (pinion reference: 39883)
41-tooth ring gear
Fits RDXX160 and RPXX160 axle models
Tech Specs
- Ratio: 4.10
- Pinion Tooth Count: 10
- Gear Tooth Count: 41
- Pinion Part Number: 39883
- Axle Model: RDXX160, RPXX160
Used in these Meritor models