i would look for a 51-54 1/2 ton axle then get the 51-54 passenger car hubs and drums like Pre68dave says, since he has done this to a 37 before.....mine is a 46 and my front axle is a 3"in drop axle from nostalgia sid's maybe you might checkout his website.....www.droppedaxles.com he has all kinds of different axles
