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.com4303556 Eaton Fuller Super 10 Forward Housing Shift Lever | New OEM Genuine | Tall Shift Lever
4303556 Eaton Fuller Super 10 Forward Housing Shift Lever – New OEM Genuine – S2283 Tall/High – 11.250”...Regular price $197.47 USDSale price $197.47 USD Regular priceUnit price per$274.47 USDSale -
Vendor:truckparts4u.com4300810 Eaton Fuller Super 10 Insert Valve RTLO 10 Speed | New (NOS) OEM Genuine
4300810 Eaton Fuller Super 10 Insert Valve — RTLO 10-Speed — New Genuine (NOS) The 4300810 Eaton Fuller...Regular price $44.74 USDSale price $44.74 USD Regular priceUnit price per$119.66 USDSale -
Vendor:Eaton / Dana Heavy Axle40638 | Eaton / Dana-Spicer 24V 2-Speed Diff Lock Motor | New OEM (NOS)
40638 Eaton Dana 2-Speed Motor — 24V Electric Diff Lock | 113743 | Fasco 2807-508-023 | New Genuine...Regular price $197.74 USDSale price $197.74 USD Regular priceUnit price per -
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:truckparts4u.com40-35-17-1X Dana Spicer 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 shaft...Regular price $295.00 USDSale price $295.00 USD Regular priceUnit price per -
Vendor:truckparts4u.com40-35-16-1X Dana Spicer TTC Input Shaft | ES42-5 | New Genuine
40-35-16-1X Dana Spicer TTC Input Shaft — CM4054 Series — New Genuine The 40-35-16-1X Dana Spicer TTC input...Regular price $295.00 USDSale price $295.00 USD Regular priceUnit price per -
Vendor:Detroit Locker390KQ100X Dana Spicer S400 Differential Case Kit | Ratio 2.81–2.92 | New OEM
Part Number: 390KQ100XBrand: Dana SpicerCondition: New OEMSeries: S400Application: Front and RearRatio Range: 2.81–2.92 This is a Genuine Dana...Regular price $524.47 USDSale price $524.47 USD Regular priceUnit price per -
Vendor:Eaton / Dana Heavy Axle390KG213-X Gearset | Genuine Dana Spicer S400 Rear R3.21, International 2500199C91
Product Summary Part Number: 390KG213-XCondition: NewBrand: SpicerAxle Model: S400-RRGear Ratio: 3.21Invoice: KIT-GEAR SET 3.21RRRing Gear Size: 15.35 inches...Regular price $1,574.74 USDSale price $1,574.74 USD Regular priceUnit price per -
Vendor:Eaton / Dana Heavy Axle390KG120-X Gearset | Dana Spicer S400 R3.54, International 2500209C91 – New
Product Summary Part Number: 390KG120-XBrand: SpicerAxle Model: S400Gear Ratio: 3.54Ring Gear Size: 15.35 inchesCondition: New Key Features/Specifications Ring...Regular price $1,574.47 USDSale price $1,574.47 USD Regular priceUnit price per -
Vendor:Eaton / Dana Heavy Axle390KG106-X Gearset | Dana Spicer S400F R3.91, International 2500160C91 – New
Product Summary Part Number: 390KG106-XBrand: SpicerOEM Reference: International 2500160C91Axle Model: S400FGear Ratio: 3.91Condition: New Key Features/Specifications Ring Gear...Regular price $1,574.47 USDSale price $1,574.47 USD Regular priceUnit price per -
Vendor:truckparts4u.com390KG102-X Gear Set | Used Dana Spicer S400-R 3.07 Ratio, International 2500158C91
Product Summary Part Number: 390KG102-XCondition: UsedBrand: SpicerAxle Model: S400Gear Ratio: 3.07Ring Teeth Count: 43Pinion Teeth Count: 14Ring Gear...Regular price $1,147.74 USDSale price $1,147.74 USD Regular priceUnit price per -
Vendor:Eaton / Dana Heavy Axle390DU103 Flange Half | Dana Spicer S400 | Ratio 3.21–3.73 | NOS - Genuine
390DU103 Differential Flange Half — Dana Spicer S400 | Casting 390DU102 | New Old Stock (Surplus) 390DU103 is...Regular price $177.47 USDSale price $177.47 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.