I am helping my son put his 1968 Cougar XR7 with a 302 C4 automatic back together now. We bought it without an engine or transmission, so those will be replacements. I just pulled a driveshaft from another 1968 parts Cougar I have, but I don’t think it is the original C4 driveshaft from the car. Has anyone seen a fully round slip yoke like this one? And from the “shiny” mark on the driveshaft, it appears that only approximately 1 inch of the driveshaft splines were engaged. That seems a little dangerous to me. Isn’t the engagement supposed to be several inches? I am assuming the correct C4 slip yoke is the longer one (about 9 inches) - rather than the shorter - in the second photo? Any help would be greatly appreciated. Thanks, Scott
By the way, the “parts” Cougar, was originally a 302 3 speed car, but had a C4 auto installed at some point. Could that be the 3 speed drive shaft shown in photo #2?
Someone correct me if I am wrong but, I believe the way to tell if you have the correct length drive shaft is to push it all the way into the transmission and if you have about an inch gap to the rear end yoke you are OK.
1967-68 C-4 drive shafts almost always are a tube inside of a tube. You should be able to see the rubber in the opening of the division.
Your slip yoke looks like style we have removed from a 1967 Thunderbirds.