This is an Input Shaft with 17 teeth for the GM SM465 4 Speed. This Input Shaft is 1 1/16" long and has 10 Splines and is used in the transmission that has the N1211L, B55-59 or 211MG1 input bearing that is 0.68" (17.28mm) thick. Identify this transmission by the iron top cover. It has 2 PTO Openings and has a 12" overall case length. 4 Speed transmission for years 1968-87. If you have an 88-up SM465 Transmission with the aluminum top cover that uses the TM211 or 211FFLE input bearing that is 0.83" (21mm) thick then you will need a different input shaft. The input shaft is totally different but we have them available. Please contact us if that is what you need.