Not sure rear axle or brakes

Had swapped rear axle assembly from 2003 Dodge Ram 1500 and put it in my truck listed above, it is a 1500. Rear of truck on jack stands. With out brake assembly on rear axle assembly runs great. Both left/right wheel move smoothly and no noise from rear axle. I just put new brake pads/calipers on. I have the "L" caliper on driver's side and "R" on the passenger side. Everything has been greased, clips, slide pins. When I put the truck in "drive" still up on jack stands tires off, the passenger side spins and stops when brake is applied. The driver side does not move. I just purchased these brake pads/calipers yesterday. Help!