A lifting device powered by an impact wrench, specifically designed to raise a on car railway freight car coupler. The embodiment of the invention disclosed herein comprises:A base plate that houses a load bearing that a lifting screw rod fits into and rotates on. A top plate that houses a pilot bearing that the screw rod passes through and is held vertical by, thereby stabilizing load being lifted. Four stachion rods that connect the top and bottom plates forming the coupler lift body.A lifting block with carrying handle that threads onto the screw rod with an attached arm that engages the freight car coupler. The lifting block is powered up and down the screw rod by applying an impact wrench to the attached socket at top of same.