Updated 23T 3rd Gear with Torque Lock Style 3-4 Slider for the GM SM465 4 Speed years 1968 and on. Fits all SM465 units Early or Late! Identify this transmission by the iron or aluminum top cover. It has 2 PTO Openings and has a 12" overall case length. 4 Speed transmission for years 1968 and on. This will solve the problem of the transmission jumping out of 3rd gear going down hills or hard on the gas towing a load.