Way back when we started this build it was a complete car with a 6 and a pg. Along the way we picked up two other 64 parts cars in different stages of tear down. Do not recall if they had drive shafts in them. So for a while we had a lot of parts lying around and I just can't be 100% sure the rear half shaft came from the original 64. It seems that it did but it does not fit and it is 33 1/2 inches long which does not fit the spec for these cars.
Since the car is on bags I had thought I should use a slip joint in the drive line so after looking around for a bit I replaced the rear half shaft with a Ford Explorer half shaft that fit perfectly and seemed to solve the pending issue of flexibility.
Steve, we have been experiencing a vibration on the road now that we are driving the car so in an effort to determine this the drive line came under scrutiny. Seemed simple enough last week to change back to the stock shaft! LOL And hence the issue.
Removing the previous shaft seems to have corrected the vibration however even though it is a bit short and we only have the center bearing holding with one bolt at the moment. The real cure is to get a spec rear shaft which I am about to do following the holiday.
Skip, the front shaft fits perfectly if you slide it in to the point that you can get the bearing bolted down with the two bolts as required. The issue is the shorter rear shaft and for the life of me I can not figure out where it came from. It had to come from one of the other two parts cars I suspect as there are no other explanations. I must have swapped the shafts at some point in time and never realized that one was shorter than the other. What threw me off is that fact that I had this shaft completely rebuilt with new joints, painted the same color of the front shaft and in storage with the other spare parts for the car. I am certain that it was at one time installed with the front shaft but cannot now be 100% sure that it was put in the car. I am going to look at the build pics to see if I can determine if it was installed into the frame during the build. It sure is a mystery!