drum moves in and out.......

[danielzink]

Here's one for the pros.
Doing the final install of the notch motor yesterday and had the rear of the car jacked up - rear wheels off the ground - and I grabbed the pass. side rear tire to get up off the floor and it moved - outward !
Like if I grab it again - there is definite movement in and out. As if the axel is sliding around - in and out of the transmission. It's not a ton of play but enough that it's noticeable.

Any ideas ?

Thanks, Dan