Ford 600-800 Tractor 4 Speed Transmission Top Shaft & Gears- Fine Splines. Good used Ford 600-800 Tractor 4 Speed Transmission Top Shaft & Gears- Fine Splines. I always try to do my best to make sure that my customers are satisfied. I sell used parts, they are USED. I try to describe them the best that I can, but I do miss things. _gsrx_vers_468 GS 6.4 (468). The item “Ford 600-800 Tractor 4 Speed Transmission Top Shaft & Gears- Fine Splines” is in sale since Sunday, February 23, 2020. This item is in the category “Business & Industrial\Heavy Equipment, Parts & Attachments\Heavy Equipment Parts & Accessories\Complete Engines & Engine Parts”. The seller is “dhusedtractorparts” and is located in Smithville, Missouri. This item can be shipped to United States.