Thanks to Jim Davis and Harry Yarnell, I am now enlightened. Turns out I have a 66-69 4 Speed transmission and a 66-69 3.27 Diff. Trick to telling the difference in a 3 Speed and a 4 Speed transmission is the length of the input shaft and the number of splines on the transmission end of the shaft. Thanks again for the help. How did youse guys get so smart? Cecil Mills Cocoa, Fl.