I was talking to my brother that has a 2013 Ram 2500 4x4 about front lockers. I looked up the ARB air locker and it looks like it's also compatible with the GM AAM 9.25" from 88-12 trucks (IFS vs SFA)? I've got an 'ol 2000 K3500 that I rarely use on 4x4, until this snow storm that is! I've dreamed of making it kinda like a cool off road rig down the road... The ARB is kinda pricey and then you need an air compressor. I know lockers are not inexpensive, but: Are there any other options for that GM axle? Needs to be selectable for steering purposes, right?