Passenger motor mount is loaded under torque. Driver side is one under stress. Dont consider that is it.

There is some WINK in gear sets but should be less than 15 degrees and similar between wheels - tested with parking brake OFF please. Use parking brake to hold axle and see driveshaft motion.... Guess about 1 inch around shaft; motion or play.

Did u check fluid for -COLOR??? Honey no silver!!!! Woody