Check the listing for details. Transmission Mainshaft Inner Bearing Race Installation Tool for Big Twin Harley. Condition: New. Listed at 62.98 USD. This listing is for a new Transmission Mainshaft Bearing Inner Race Installer Tool Set designed for Harley Davidson. Application: This tool compatible with all Harley Davidson 1984 to Present, Five (5) and Six (6) Speed Transmission Big Twins. It replaces OEM Tool # 34902-84. The tool has 3/4-18 Left Hand Internal Thread. Function: Designed to install the mainshaft inner bearing race on 5 and 6 speed transmissions. Material: Made of 1045 cold rolled steel, which is sturdy and durable. This tools kit is professionally made in the United States on the state of the art CNC equipment with 100% quality inspection. Tool comes with black oxide finish preventing corrosion to assure many years of service. Condition: 100% Brand New tool kit Package Includes: 1 x Transmission Mainshaft Bearing Inner Race Installer Tool Set ( as the picture shows).