I ain't for sure & it would depend on how sloppy it is. How much end play does the driveshaft have? (when you butt it all the way into the trans how much distance is there to move it back till the rear ujoint is seated). excessive endplay is more likely to be a cause than a worn bushing (unless it is real bad) & right now I'm thinking the bushing ain't the problem (it might not be perfect but I am thinking elsewhere) however too much end play can definitely be it. I like ~3/4-7/8, enough to get the ujoint over the yoke when installing plus a bit more measured with springs compressed at ride height/weight (stands under axle). plus we have the angles and the pig as potentials. As Cab says we gotta stay after it.