[Mr. G]

1970 Trans am with 3: 73 12 bolt rear end. Took the driveshaft to a shop for new u-joints and the rear u-joint fits loosely in the yoke allowing it to slide side to side. I am trying to figure out if it is the wrong u-joint of if it is possible that the yoke is worn which is what the shop says is the problem. I am wondering if the 12 bolt u-joint is wider than the ten bolt u-joint thus possibly being the issue. I had the u-joints done many years ago and can't recall if i made it clear to them that it was a 12 bolt rear end that we were dealing with. So, the question is are the u-joints for 10 and 12 bolt rear ends the same and if not, what would be the width of each of them so I can measure what the shop installed and determine if that is the problem or not? Also, has anyone had a problem with a worn yoke causing a loose fit for a u-joint? Thanks in advance for any insight.