Jims Tools Transmissions
Representative Photo, actual item may vary
Jims Tools Transmissions: Precision-Engineered for Harley-Davidson
When it comes to Harley-Davidson transmissions, few names carry more authority than Jims Tools (JIMS USA). From humble beginnings in 1967, JIMS has grown into one of the industry leaders producing performance parts, accessories, tools, transmissions, and high-performance engines all aimed at enhancing the Harley rider's experience. That decades-long focus on V-Twin drivetrain engineering means every transmission product JIMS offers has been developed with a deep, hands-on understanding of what Harley gearboxes demand.
A Transmission Lineup Built for Real-World Performance
JIMS has built a reputation for manufacturing and assembling quality transmissions, including 5 and 6 speeds, Right Side Drives with bearing support, and the JIMS Fat 5™ overdrive. These aren't generic replacements — they're purpose-built upgrades. The JIMS Fat 5 Overdrive is engineered for maximum durability, taking advantage of a more compact shifter design to increase the width and strength of every gear — a width increase that varies from 18% to 53%, depending on the loads each gear set must carry.
Complete transmission assemblies from JIMS are shipped fully loaded with premium components, including forged gears with input ramp and back-cut engagement dogs, close 1st gear ratio, precision-machined and heat-treated counter and main shafts, chrome-plated billet trap doors, chrome-plated billet top and side covers, and JIMS performance gaskets.
The transmission catalog also extends well beyond complete assemblies. JIMS covers the full spectrum of rebuilding needs, from complete transmissions and gear sets to mainshafts and parts, shifter drums, shifter forks, transmission bearings, and comprehensive rebuild kits for 4-speed, 5-speed, and 6-speed configurations.
Specialty Transmission Tools That Professionals Trust
What truly sets JIMS apart in the transmission space is the brand's dual identity: not only do they manufacture transmissions and components, they also engineer the specialized tools required to service them. Every tool from Jims is designed to save time when working on your bike, and many of these same tools are employed by mechanics at Harley-Davidson dealers because they are smart, well-made, and built to last. The transmission-specific tool lineup is extensive, ranging from 5-Speed and 6-Speed case shifter shaft seal installers, door removal tools, transmission trap door bearing installation and removal tools, shift fork gauges, and sprocket shaft bearing race tools.
All JIMS manufactured tools are machined in the USA and are guaranteed for life — a standard that reflects the brand's aerospace-grade machining roots and commitment to professional-level quality.
Coverage Across the Harley-Davidson Legacy
JIMS carries parts and tools for Knucklehead, Milwaukee-Eight®, and every bike in between — which means whether you're rebuilding a vintage 4-speed or upgrading a modern 6-speed Cruise Drive, JIMS has a solution engineered to fit. The talented and experienced engineers at JIMS develop and modify transmissions and components for both racing and improved street performance, operating out of a facility that has grown from just a few manual mills and lathes to high-tech CAD and CNC equipment across 50,000 sq. ft. of production space.
Whether you're a professional technician searching for the right installation tool or an enthusiast tackling a full gearbox rebuild, JIMS transmission products deliver the precision, coverage, and American-made quality that serious Harley work demands.