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.comS2283 Eaton Fuller Super 10 Shift Tower Assembly | New OEM
S2283 Eaton Fuller Super 10 Forward Tall Shift Tower Assembly – New OEM Genuine – Complete, No Gaskets...Regular price $374.47 USDSale price $374.47 USD Regular priceUnit price per$574.47 USDSold out Sale -
Vendor:truckparts4u.comKIT2229 Meritor Nest Kit F106-34 Spline | 2234-N-872 Axle Gears, Thrust Washers, Spider Gears | New Aftermarket
KIT2229 Meritor Nest Kit F106-34 Spline, 2234-N-872 Axle Gears, Thrust Washers, Spider Gears – New Aftermarket Product Summary:KIT2229...Regular price $247.47 USDSale price $247.47 USD Regular priceUnit price per -
Vendor:truckparts4u.comK3352 | Eaton Fuller Wiring Harness | RTAO Series | Includes 691388 & 691439 | New OEM
K3352 Eaton Fuller Wiring Harness for “RTAO” Series Transmissions – Includes 691388 & 691439 Harness Adaptors – New...Regular price $497.47 USDSale price $497.47 USD Regular priceUnit price per -
Vendor:truckparts4u.comK2363 | Eaton Fuller Mid-Range Shift Tower w/Rev Stop | 4301118 | New OEM
K2363 Eaton Fuller Mid-Range Shift Tower w/ Reverse Stop — New OEM This genuine Eaton Fuller shift tower...Regular price $227.47 USDSale price $227.47 USD Regular priceUnit price per -
Vendor:truckparts4u.comA6909 Eaton Fuller Pistol Grip Style Shift Knob/Valve Assembly | New Genuine Fuller
A6909 Eaton Fuller Pistol-Grip Shift Knob / Valve — New Genuine New Genuine Eaton Fuller pistol-grip master shift...Regular price $74.47 USDSale price $74.47 USD Regular priceUnit price per$128.83 USDSale -
Vendor:truckparts4u.comA5021 | Eaton Fuller Input Shaft 20787 | RT7608LL RT8609 | New Genuine OEM (NOS)
Eaton Fuller A-5021 Input Shaft 20787 — RT7608LL / RT8609 — New Genuine (NOS) The A-5021 Eaton Fuller...Regular price $394.47 USDSale price $394.47 USD Regular priceUnit price per$574.47 USDSale -
Vendor:truckparts4u.comA4493 | Genuine Fuller 13-Speed Shift Knob | “Puck” Style | Eaton Roadranger | New NOS
A4493 / A-4493 Genuine Fuller 13-Speed "Puck" Style Shift Knob – New (NOS) | Eaton Roadranger Product Summary:The...Regular price $177.47 USDSale price $177.47 USD Regular priceUnit price perSold out -
Vendor:truckparts4u.comA40682-1-740 Gearset | Meritor Rockwell AxleTech SSHR R155 37-5 | New
A40682-1-740 Gearset | SSHR / R155 | 7.40 Ratio | 39-Spline | New Aftermarket A40682-1-740 is a New...Regular price $1,874.47 USDSale price $1,874.47 USD Regular priceUnit price per -
Vendor:truckparts4u.comA40674-6-529 Gearset | Meritor Rockwell AxleTech SSHR R155 37-10 | New PAI/Excel
A40674-6-529 Gearset | SSHR / R155 | 3.70 Ratio | 10 Spline | Aftermarket A40674-6-529 is an aftermarket...Regular price $1,874.47 USDSale price $1,874.47 USD Regular priceUnit price per -
Vendor:truckparts4u.comA40674-1-529 Gearset | Meritor Rockwell AxleTech SSHR R155 37-7 | New
A40674-1-529 Gearset | 5.29 Ratio | Meritor SSHR / R155 | New OEM A40674-1-529 is a New OEM...Regular price $1,874.47 USDSale price $1,874.47 USD Regular priceUnit price per -
Vendor:truckparts4u.comA40306-1-683 Gearset | Meritor Rockwell AxleTech SSHD 41-6 | Genuine OEM
A40306-1-683 Gearset | Rockwell SSHD-R 6.83 | 41/6 Ratio | New Genuine A40306-1-683 is a New Genuine OEM...Regular price $1,874.47 USDSale price $1,874.47 USD Regular priceUnit price per -
Vendor:truckparts4u.comA40178-1-529 Gearset – SSHD 5.29 Ratio (37-7) | Meritor Rockwell AxleTech – New Italian
A40178-1F Gearset | SSHD-F 5.29 | Global Drivetrain | 37/7 Ratio | New Aftermarket A40178-1F is a new...Regular price $1,874.47 USDSale price $1,874.47 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.