Lots of replies... Thanks for the help.
To clarify Blankenship, It wouldn't go forward, but I could still use reverse just fine. You are correct, it's a 31 spline. From what I've read, Ford put the 28spline axles in cars and early broncos. The 31 splines were found in 70's model trucks, Torinos, and a few HiPo Stangs.
Anyway,
Rented the slide hammer at Ho'reillys, and got the shafts out... Not pleased with what I found. Here are some pics.
It looks as though my driver's side shaft doesn't have a bearing on it. I looked through the axle housing, and it looks like something broke off in there very close to the third member. (see pics) The pic of the shaft with the bearing is my passenger side shaft which looks fine.
Any thoughts as to what may have happened, and why is there no bearing on my axle? I'm guessing the bearing grenaded and is what is stuck inside the axle housing. Going to do some homework for a while, then I'll probably go and pull the third.