When you move a trailer axle from above the springs to below the springs to gain elevation of the trailer, the most common question asked is….
Can I just flip the axle over and use the existing spring cradles?
Axles are arched to add strength and flexibility. So the answer is no, you have to weld on new spring cradles. In fact just recently I saw some new replacement axles and they had cradles welded on top and bottom right from the factory (somebody was thinking).