ya know front range also has the lockin hubs for the rear disc brake set up that will not be selectable, meaning that its a hub that is always locked instead of the manual ones from the front. I belive the japanese made a set for toyotas a while back and i think if i am correct front range can get them too. Now there are advantages and disadvantages to that. if you tow your rig on a dolly you could turn the manual hubs in the rear to free and tow it down the road problem free. Disadvantage would be you couldnt tow it , you could but it would be rough, plus people might screw around with you and turn the hubs when youre looking at another rig. who knows witch one is stronger. That will be an awsome up grade disc brakes witha full floater rear end , beefy i like that !!!