Collection: All Gearing | Dana Spicer, Meritor, Rockwell, Eaton | NOS & OEM Heavy-Duty Gears
All Gearing – Heavy-Duty Differential & Transmission Gears
Shop a massive selection of heavy-duty ring & pinion gearsets, axle gears, side gears, spider gears, and transmission gears. We stock New Genuine, New Old Stock (NOS), and quality take-out gearing from Dana Spicer, Meritor, Rockwell, AxleTech, Eaton Fuller, and more.
Whether you need to rebuild a differential, change gear ratio for better pulling power or fuel economy, or replace worn transmission gears, Discount Parts Exchange has the right gearing in stock and ready to ship from Mansfield, Ohio.
Why Shop DPX Gearing?
- Hard-to-Find NOS & Genuine OEM Parts — Many no longer available from dealers
- Popular Applications — Dana S135, S150, DS/RS series, Meritor 140/145/160 series, Eaton Fuller transmissions, and more
- Expert Support — Not sure what ratio or part you need? Send us your axle tag or BOM number — we’ll help you get the right gearset fast
Call our drivetrain specialists at 419-522-3320 for compatibility help and availability.
DPX Drivetrain Tools Hub
Free tools built by rebuilders for truckers and fleets — Road Speed & Ratio Calculator, gear ratio comparison charts, and full IPL library.
Open DPX Drivetrain Tools Hub →
Heavy-Duty Solutions — Built to Perform. Trusted to Last. Discount Parts Exchange (DPX) — Since 1997.
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Vendor:Fabco432-0668 | Fabco TC200 Transfer Case Gear | Navistar 1677313C1 | New Genuine (NOS)
432-0668 Fabco Intermediate Shaft Gear is a new (NOS) genuine replacement part for Fabco TC200 Transfer Cases. Also...Regular price $2,287.47 USDSale price $2,287.47 USD Regular priceUnit price per -
Vendor:Eaton / Dana Heavy Axle40638 | Eaton / Dana-Spicer 24V 2-Speed Diff Lock Motor | New OEM (NOS)
40638 | Eaton / Dana-Spicer 24V 2-Speed Diff Lock Motor | New Genuine (NOS) New genuine Eaton /...Regular price $377.74 USDSale price $377.74 USD Regular priceUnit price per$497.65 USDSale -
Vendor:Eaton / Dana Heavy Axle401KG126-X Gearset | Genuine Dana/Spicer N400 Front R6.14, International 1665350C91
Product Summary Part Number: 1665350C91 / 401KG126-XCondition: NewBrand: SpicerAxle Model: N400 / N340Gear Ratio: 6.14Ring Gear Size: 15.500...Regular price $1,574.47 USDSale price $1,574.47 USD Regular priceUnit price perSold out -
Vendor:Spicer Transmission40-35-17-1X Dana Spicer | Tremec, TTC | Input Shaft | ES42-5 | New Genuine
40-35-17-1X | Dana Spicer TTC Input Shaft — ES42-5 — New Genuine The 40-35-17-1X Dana Spicer TTC input...Regular price $295.00 USDSale price $295.00 USD Regular priceUnit price per -
Vendor:Eaton / Dana Heavy Axle390KQ100X Dana Spicer S400 Differential Case Kit | Ratio 2.81–2.92 | New OEM
390KQ100X | Dana Spicer S400 Differential Case Kit | 2.81–2.92 Ratio – New Genuine (NOS) 390KQ100X is a...Regular price $524.47 USDSale price $524.47 USD Regular priceUnit price per$1,589.32 USDSale -
Vendor:Eaton / Dana Heavy Axle390KG213-X Gearset | Genuine Dana Spicer S400 Rear R3.21, International 2500199C91
390KG213-X | Dana Spicer S400 Rear Gear Set | 3.21 Ratio – New Genuine (NOS) 390KG213-X (International cross...Regular price $1,147.74 USDSale price $1,147.74 USD Regular priceUnit price per$1,574.74 USDSale -
Vendor:Eaton / Dana Heavy Axle390KG120-X Gearset | Dana Spicer S400 R3.54 | International 2500209C91 | New
390KG120-X | Dana Spicer S400 Rear Gear Set | 3.54 Ratio – New Genuine (NOS) 390KG120-X (International cross...Regular price $1,174.47 USDSale price $1,174.47 USD Regular priceUnit price per$1,574.47 USDSale -
Vendor:Eaton / Dana Heavy Axle390KG106-X Gearset | Dana Spicer S400F R3.91, International 2500160C91 – New
390KG106-X | Dana Spicer S400F Rear Gear Set | 3.91 Ratio – New Genuine (NOS) 390KG106-X (International cross...Regular price $1,174.47 USDSale price $1,174.47 USD Regular priceUnit price per$1,574.47 USDSale -
Vendor:Eaton / Dana Heavy Axle390KG102-X Gearset | Used Dana Spicer S400-R 3.07 Ratio | International 2500158C91
390KG102-X-U | Dana Spicer S400-R Ring & Pinion Gear Set | 3.07 Ratio – Used 390KG102-X-U (International cross...Regular price $847.74 USDSale price $847.74 USD Regular priceUnit price per$1,147.74 USDSale -
Vendor:Eaton / Dana Heavy Axle390DU103 Flange Half | Dana Spicer S400 | Ratio 3.21–3.73 | NOS - Genuine
390DU103 | Dana Spicer S400 Differential Flange Half | Casting 390DU102 – New Genuine (NOS) 390DU103 (casting 390DU102)...Regular price $177.47 USDSale price $177.47 USD Regular priceUnit price per -
Vendor:Meritor3892Z4940 Planetary Gear | Meritor-Rockwell-Axle Tech | Genuine
3892Z4940 | Meritor-Rockwell-AxleTech Planetary Gear | New Genuine (NOS) New genuine Meritor / Rockwell / AxleTech planetary gear...Regular price $347.47 USDSale price $347.47 USD Regular priceUnit price per -
Vendor:Meritor3892Z1768 Spur Gear | Meritor-Rockwell-AxleTech | Genuine (NOS)
3892Z1768 | Meritor-Rockwell-AxleTech Spur Gear | New Genuine (NOS) New genuine Meritor / Rockwell / AxleTech spur gear...Regular price $947.47 USDSale price $947.47 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.