Collection: All Gearing – Discount Parts Exchange Since 1997
Heavy-Duty Differential & Transmission Gearing
Shop our complete selection of heavy-duty gear sets for Class 6, 7, and 8 trucks. We stock differential ring & pinion sets, axle gearing kits, and transmission gears from leading OEMs like Dana Spicer, Eaton, Meritor, and Rockwell. Whether you need to rebuild, re-gear, or upgrade for torque, economy, or hauling power, these genuine and aftermarket gear sets are built to perform under the toughest conditions.
Gearing Options
- Differential Gearing: OEM ring & pinion sets, matched gear pairs, spider and side gears for popular models including Dana S135, S150, DS/RS404, and Meritor 145/160 series.
- Transmission Gears: Mainshaft, countershaft, splitter, and auxiliary gears for Eaton Fuller transmissions and more.
- Condition Choices: New Old Stock (NOS), verified take-out assemblies, and premium aftermarket gearing.
Why Choose Our Gear Sets
- Application-specific expertise: Ratio recommendations for engine, tire size, and duty cycle.
- Quality assurance: Each gear inspected for wear, tooth pattern, and OEM compatibility.
- Fast shipping: U.S. warehouse in Mansfield, Ohio — international shipping available.
Fitment Help
Not sure which gearset fits your axle or transmission? Provide us your axle tag, BOM, or transmission model number — we’ll confirm the correct ratio and part number before shipping. Call 419-522-3320 for expert support.
Heavy-Duty Solutions — Built to Keep Your Drivetrain Moving.
Built to Perform. Trusted to Last.
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Vendor:truckparts4u.com3892A4473 Meritor-Rockwell-Axletech M923/M939 Helical Gears | New Genuine
3892A4473 Helical Gear | Meritor Rockwell AxleTech | M923/M939 Transfer Case | New Genuine 3892A4473 is a New...Regular price $124.47 USDSale price $124.47 USD Regular priceUnit price per -
Vendor:truckparts4u.com3891U1087 Meritor Rockwell Axletech L-345 Helical Pinion Gear | Genuine OEM
3891U1087 Meritor Rockwell Axletech L-345 Helical Pinion Gear – Genuine OEM (New) Product Summary:Genuine Meritor / Rockwell /...Regular price $547.47 USDSale price $547.47 USD Regular priceUnit price per -
Vendor:truckparts4u.com3891Q1629 Meritor Rockwell Axletech Planetary Spur Gear | T2111 Transfer Case | Genuine OEM
3891Q1629 Meritor Rockwell Axletech Planetary Spur Gear – Genuine OEM (New) Product Summary:Genuine Meritor / Rockwell / Axletech...Regular price $277.47 USDSale price $277.47 USD Regular priceUnit price per -
Vendor:truckparts4u.com3891F942 Meritor Rockwell Axletech Helical Gear | L340 Fast Ratio | Genuine OEM
3891F942 Meritor Rockwell Axletech Helical Gear – Genuine OEM (New) Product Summary:Genuine Meritor / Rockwell / Axletech helical...Regular price $347.74 USDSale price $347.74 USD Regular priceUnit price per -
Vendor:truckparts4u.com3880F708 Meritor Rockwell Thru Shaft | Genuine OEM
3880F708 Meritor Rockwell Thru Shaft – Genuine OEM Product Summary:Genuine Meritor Rockwell Axle Tech Thru Shaft, part number...Regular price $274.47 USDSale price $274.47 USD Regular priceUnit price per -
Vendor:truckparts4u.com3869006 | GM H150 H170 Differential Gear Set | 5.83 Ratio | New Aftermarket
3869006 | GM H150 H170 Differential Gear Set | 5.83 Ratio | New Aftermarket Product Summary:This new aftermarket...Regular price $574.47 USDSale price $574.47 USD Regular priceUnit price per -
Vendor:truckparts4u.com3802S1059 Axle Shaft | Meritor-Rockwell-Axletech | 17.62" Length | New Genuine
3802S1059 axle shaft is a New Genuine OEM component designed for Meritor, Rockwell, and Axletech axle assemblies. This...Regular price $1,174.47 USDSale price $1,174.47 USD Regular priceUnit price per -
Vendor:truckparts4u.com3785597 | GM H052 / HO52 Gear Set – 4.57 Ratio (1949–1972 Trucks, Aftermarket NOS)
3785597 GM H052 / HO52 GEAR SET 4.57 RATIO – New Aftermarket (NOS) Product Summary:New aftermarket gear set...Regular price $347.74 USDSale price $347.74 USD Regular priceUnit price per$375.00 USDSale -
Vendor:truckparts4u.com37-35-12-1X Spicer / TTC Input Shaft | New Genuine (NOS)
37-35-12-1X Spicer / TTC Input Shaft — New Genuine (NOS) The 37-35-12-1X Spicer / TTC input shaft is...Regular price $247.74 USDSale price $247.74 USD Regular priceUnit price per -
Vendor:Eaton / Dana Heavy Axle360SR104-1 Dana Spicer Axle Shaft | S135/S150 | 36 Spline | New Genuine Take-Out
360SR104-1 Dana Spicer Axle Shaft — S135 / S150 / G360CA | 36 Spline | New Genuine Take-Out...Regular price $474.47 USDSale price $474.47 USD Regular priceUnit price per -
Vendor:Eaton / Dana Heavy Axle360KG120-X Gearset | Dana S135/S150 | 5.38 Ratio | New Genuine
360KG120X Dana Gearset | S135 S150 G360CA | 5.38 Ratio | 1697157C91 | New Take-Out The 360KG120X is...Regular price $1,347.74 USDSale price $1,347.74 USD Regular priceUnit price perSold out -
Vendor:Eaton / Dana Heavy Axle360KG107-X Gear Set | Genuine OEM Dana S135/S150 4.44 Ratio
360KG107X Dana Gearset | S135 S150 G360CA | 4.44 Ratio | 1695924C91 | New Genuine The 360KG107X is...Regular price $1,347.74 USDSale price $1,347.74 USD Regular priceUnit price per
Your #1 Source for Remanufactured Transmissions, Differentials, Transfer Cases & PTOs — Since 1997
Trusted by Fleets & Technicians for Over 25 Years
Discount Parts Exchange delivers quality, reliability, and value in every drivetrain component. Backed by decades of hands-on experience, our heavy-duty solutions are built to keep your truck running.