All the truck C6`s that I have seen that used the bolted on flange for the driveshaft had been the short tailhousing variety. The splines on these "shorty" C6`s are much coarser (thicker and fewer in number) than the 31 spline slipyoke models. A friend of mine did use a shorty C6 when he converted his Shell Valley Cobra kit car into a drag only car years ago, by cutting off the threaded end of the tailshaft, and modifying the bolt on flange to work as a slipyoke. His only reason for going this route was that a long shaft C6 would have meant an extremely short driveshaft would be needed. It worked OK on his fairly lightweight drag car, but I wouldn`t think it would be that great in a street car. I have seen several Ford pickups with the long tailhousing and slipyoke used in FE aplications during the last years of FE production, 75 &76. Maybe it was a running change?
428 powered Fairmont drag car, Best ET:10.03@132.11MPH, best 60 ft: 1.29
59 Meteor 2 dr. sedan 332, Ford O Matic
74 F350 ramp truck 390 4speed
