Motorshop ES 4-Speed Transmission Case for Harley FL/FX (1977–1979)

This ES 4-Speed Transmission Case delivers durable, race-tested performance with a Torrington needle-type mainshaft bearing and a reverse gear idler shaft that avoids the issues of loose roller designs, ensuring steadier engagement and long-term reliability for vintage Harley builds.

Key details and compatibility:

• Fits 1977–1979 Harley Davidson FL and FX models
• Made in Taiwan to standard quality benchmarks
• Mainshaft bearing: Torrington needle type
• Reverse gear idler shaft designed to avoid loose-roller behavior
• Accepts #12-0300 Torrington style 4th gear bearing
• OEM cross reference: 34702-78
• Bushings are not pre-installed; verify clearance for the speedometer drive

Installation and use notes:

• Loctite on mount studs is recommended to secure mounting and ensure optimal operation
• Sold as a Bill of Sale only — no Manufacturer's Statement of Origin required
• For specific model-year fitment updates, consult the guidance to use #17-0101 bearing retainer and #17-9883 housing for 1981–1984 models if applicable

Recommended pairings to complete a rebuild or upgrade:

• 4-Speed Big Twin Transmission Assembly
• Hitachi Starter Housing Kit
• Gear Box with Components

ES 4-speed transmission case accepts ratchet top.

Upgrade your Harley Davidson motorcycle with the Motorshop 4-Speed Transmission Case ES, designed specifically for 1977-1979 Harley Davidson FL and FX models. Constructed in Taiwan, this transmission case offers reliable performance and compatibility with OEM components. It features a mainshaft bearing using Torrington needle type and a reverse gear idler shaft, providing enhanced durability compared to loose roller designs. Proper installation with Loctite on mount studs is recommended to ensure secure mounting and optimal operation. This transmission case is sold with a Bill of Sale only, simplifying your purchase process without the need for a Manufacturer's Statement of Origin. Note that bushings are not pre-installed, and technicians should verify clearance for the speedometer drive to ensure proper fitment and function. The case accepts a #12-0300 Torrington style 4th gear bearing, and it is suggested to utilize a #17-0101 bearing retainer for models produced between 1981-1984, as well as a #17-9883 housing for those years, to ensure proper fitment and longevity. This component is compatible with OEM part cross-references such as 34702-78, ensuring seamless integration with your existing motorcycle parts. Designed for easy installation and long-term reliability, this transmission case is essential for rebuilding or restoring vintage Harley Davidson motorcycles. Accessories such as the 4-Speed Big Twin Transmission Assembly, Hitachi Starter Housing Kit, and Gear Box with Components are recommended to complete your transmission rebuild or upgrade. Proper handling and installation will help maintain your motorcycle’s performance and riding experience for years to come.

Features:

• Mainshaft bearing: Torrington needle type for enhanced durability

• Reverse gear idler shaft: Not the loose roller type, ensuring improved performance

• Compatibility: Fits 1977-1979 Harley Davidson FL and FX models

• Material: Made in Taiwan with quality standards

• OEM Cross Reference: 34702-78 for seamless replacement

• Installation notes: Loctite recommended for mount stud installation

• Tech notes: Accepts #12-0300 Torrington style 4th gear bearing; use #17-0101 bearing retainer and #17-9883 housing for specific model years

• Sold as: Bill of Sale only, no Manufacturer's Statement of Origin required

Fitment:
Harley Davidson FL 1977
Harley Davidson FL 1978
Harley Davidson FL 1979
Harley Davidson FX 1977
Harley Davidson FX 1978