O.K. I've wondered this for awhile. I've noticed on the GL runs the tech sheet does not allow pinion brakes. What is the reason for this? For guys who like to run rockwells this would almost completely alienate them. Sure they can spend 1,500 per axle for outboard brakes, but who's got that kinda cash? I actually sold a set of rockwells because of this. I figured if greatlakes won't allow pinion brakes, the axles would be useless under any rig of mine because I like going on GL events.