Jack it up. put the emer brake on and turn the drive shaft both ways by hand.
Should let you know where the slop is, might be as simple as a worn u joint.
_________________________
Jack Laird
Retired USAF
AN5L 24515, Eng. 9C-U-H 16218, Apr. 1959
"Miss Agatha" On the road again and smiling.
We were there, Lake of the Ozarks, 2008!!