V-Twin 45 Inch W Transmission 4-Speed Gear Kit For Harley W

Transforms your 45 inch Harley W 3-speed transmission into a four-speed system using the stock mainshaft, countershaft, shifter forks, and hardware for a straightforward upgrade.

This 10-piece kit includes all necessary gears, shifter drum, and side cover components to complete the conversion. It delivers 4-speed gear ratios: 1st 2.67:1, 2nd 2.03:1, 3rd 1.42:1, and 4th 1:1, providing smoother acceleration and improved performance over the stock 3-speed setup.

Requires enlarged side cover holes and a separately available stud set. You must use a 4-speed shifter gate; the reverse option cannot be installed with this kit.

Designed for Harley Davidson W models from 1941 to 1952, and compatible with Solo machines and Servi-cars. Crafted in Taiwan, it pairs best with the #17-1927 Sprocket Cover Mount Stud Set Parkerized for optimal fit.

• Includes gears, shifter drum, and side cover components for a complete conversion
• Uses stock mainshaft, countershaft, shifter forks, and hardware for installation
• Side cover holes must be enlarged; requires a separate stud set
• Requires a 4-speed shifter gate; reverse gear option is not available with this kit
• Fitment: Harley Davidson W models 1941–1952

45 inch W 4-speed transmission gear kit includes first 2nd 3rd gear cluster gear main clutch gear 3/4 shifter clutch 1/2 shifter clutch and shifter drum.

Upgrade your Harley Davidson W series motorcycle with the V-Twin 45 inch W Transmission 4-Speed Gear Conversion Kit. This comprehensive 10-piece kit includes all necessary gears, shifter drum, and side cover components shown in the photos, providing a seamless transformation from a 3-speed to a 4-speed transmission. Designed for use on Solo machines and Servi-cars, this kit uses the stock-type mainshaft, countershaft, shifter forks, and hardware for straightforward installation. Note that once converted to 4-speed, the reverse gear option cannot be installed, and a 4-speed shifter gate is required for proper operation. The kit necessitates side cover holes to be enlarged in the transmission case and the use of a separately available stud set. The new gear ratios are 1st - 2.67:1, 2nd - 2.03:1, 3rd - 1.42:1, and 4th - 1:1, providing smoother acceleration and improved performance compared to the stock 3-speed ratios of 2.47:1, 1.57:1, and 1.0 respectively. This kit is compatible with the stock mainshaft and hardware, ensuring a reliable upgrade for vintage Harley Davidson W models. It is recommended to pair this kit with the #17-1927 Sprocket Cover Mount Stud Set Parkerized for optimal fit and function. Whether restoring or customizing your motorcycle, this conversion kit offers an efficient way to enhance your bike’s transmission capabilities. Crafted in Taiwan, this kit is a durable solution designed to meet the demands of classic Harley Davidson motorcycles.

Features:

• Includes all gears, shifter drum, and side cover components for a complete conversion

• Transforms 45 inch 3-speed transmission into a 4-speed system

• Uses stock mainshaft, countershaft, and hardware for easy installation

• Gear ratios: 1st - 2.67:1, 2nd - 2.03:1, 3rd - 1.42:1, 4th - 1:1

• Requires enlarged side cover holes and a separate stud set for installation

• Must use with a 4-speed shifter gate; reverse gear option is not available with this kit

• Recommended pairing with #17-1927 Sprocket Cover Mount Stud Set Parkerized for optimal fit

• Designed for Harley Davidson W models from 1941 to 1950

Fitment:
Harley Davidson W 1941
Harley Davidson W 1942
Harley Davidson W 1943
Harley Davidson W 1944
Harley Davidson W 1945
Harley Davidson W 1946
Harley Davidson W 1947
Harley Davidson W 1948
Harley Davidson W 1949
Harley Davidson W 1950
Harley Davidson W 1951
Harley Davidson W 1952