I've got an 89 Cherokee with a steel rim on the rear driver side. The rim is rusted to the axle/ Drum. Any tips on getting the rim off? I've tried beating it with a 5lb hammer from the back side, using an entire cane of Kroil on it. Beat on the front side with same 5lb hammer. Drove with all lugs off, including a couple of donuts in either direction. Any other Ideas??