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:Eaton-FullerA5021 | 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 $374.47 USDSale price $374.47 USD Regular priceUnit price per$574.47 USDSale -
Vendor:Eaton-FullerA4493 | 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:MeritorA40682-1-740 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:MeritorA40674-6-529 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:MeritorA40674-1-529 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:MeritorA40306-1-683 Gearset | Meritor Rockwell AxleTech SSHD 41-6 | Genuine OEM
A40306-1-683 Gearset | Rockwell SSHD-F 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:MeritorA40178-1-529 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 -
Vendor:MeritorA40172-1-463 Gearset – SSHD Ratio 4.63 (37-8) | Meritor Rockwell AxleTech | New Italian
A40172-1F Gear Set | 4.63 Ratio | SSHD-F Forward Rear | Global Drivetrain | New Aftermarket A40172-1F is...Regular price $1,874.47 USDSale price $1,874.47 USD Regular priceUnit price per -
Vendor:MeritorA40106-5 Gearset | New OE Meritor Rockwell AxleTech RR/RS23-160 R5.63
A40106-5 Gear Set | Rockwell Meritor RR23-160 RS23-160 | Used OEM 8/45 Ratio Product SummaryPart Number: A40106-5Brand: Rockwell...Regular price $1,874.47 USDSale price $1,874.47 USD Regular priceUnit price per -
Vendor:MeritorA39496-3 Gearset | New Aftermarket Meritor Rockwell AxleTech RS15-120 Ratio 7.17
A39496-3 Aftermarket Gearset RS15-120 R7.17 | New Ring & Pinion for Rockwell Meritor AxleTech Product Summary:A39496-3 is a...Regular price $1,147.74 USDSale price $1,147.74 USD Regular priceUnit price per -
Vendor:MeritorA38988-4 Gearset | New Genuine Meritor Rockwell AxleTech RS15-120 R-3.73
A389884 Gear Set | Rockwell Meritor RS15-120 | New 3.73 Ratio 41/11 | 1694442C91 Product SummaryPart Number: A389884Brand:...Regular price $1,374.47 USDSale price $1,374.47 USD Regular priceUnit price per -
Vendor:MeritorA38818-1 Gearset | Meritor Rockwell AxleTech H172 R5.38 | Genuine OEM
A38818-1 Gearset | Rockwell Meritor AxleTech H172 | 5.38 Ratio | New Genuine A38818-1 is a New Genuine...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.