I am pretty sure all the 6 lug Spicer 70s were 27 spline then went fine spline in 69 either 32 or 35. jsut wanted someone to verify. thanks for the links but none seem to go back far enough.

FYI they were not Dana until after the W300s were born so I call them spicer. the data tags say spicer. the only reason there was a change in naming was a guy named dana changed it after the founder of the company,Mr. Spicer died. Dana was an executive and decided to put his name on parts. kinda lame I think. ;/)