Hub conversions are nothing new. Off-road enthusiasts have been doing hub conversions before unit bearings were even found on 4x4s. Guys would piece together their own packages to add bigger spindles ...
The last time around, we added a larger, slightly heavier wheel and tire combo and lost a little more than 1 mpg. Granted, with the 6.7L's whacked-out emissions system that dumps raw fuel into the ...