The answer to this doesn't seem to be as straightforward as I would think. I have a V-Code, TrackPak, 440 6bbl, 18 spline 4 speed, Dana 60 equipped 70 Roadrunner. I realize that TrackPak = Dana 60, but I am providing as much info as possible. What size is the "cross" on the front and rear U-joints, the cap diameters, and the strongest U-joint (Spicer?) I'm thinking that should be the same for all cars equipped that way. I will measure once I pull the car out, on jackstands, and get my tape, but I am short of time. Thanks.