Full support mainshaft and fifth gear design

摘要

A full support mainshaft and fifth gear design that solves the problem of fifth gear failure on NV4500 transmissions. The first embodiment comprises a sleeve that is installed over the smooth support surface of a factory mainshaft. The second embodiment is a mainshaft comprising a support shoulder, splined area, and threaded area. The sleeve of the first embodiment and support shoulder of the second embodiment are slightly greater in diameter than the splined area on the mainshaft. The inside of the gear of the present invention has both a smooth bore area and a splined area. The gear is press fit onto the mainshaft, and in the first embodiment, a spring washer, flat nut and clamp-style nut are installed on the mainshaft after the gear. In the second embodiment, a spring washer, first flat nut, tanged washer, second flat nut and lipped nut are used.