I think you need to measure as previously posted. You've never told us what the width of the joint is, just the cap diameter. A 1.063 cap (closest match to your 1.066 caliper measurement) could be a 1330-, a 1310-, or a 1210-series U-joint, and only then if all four are the same.The yoke and shaft are orginal from factory. As far as the yoke, I was looking for a gm nickel one to replace the current yoke. I appreciate the links. I'll look into it. I was hoping for greaseable joints. You don't think I could have 1330 style?
GM has been notorious for using 3R joints, but yours are smaller.
THAT explains why the driveshaft is too damn short.Since OP's truck is a lifted 2wd, that might account for the "extra" rusty part(that's not engaged in the transmission tailshaft housing)? My Burb has the same transmission and rear axle, and last time I looked at it, front yoke was in the "normal" amount. My Burb is stock height though....
How do you know it's lifted? He hasn't mentioned that in this thread.