silly question for us 4x4 guys... would disc setup from a 00 or newer work, those have been 6 lug, my dad's 2000 stepside has them, my 03 stepside had them, but my 06 sierra has drum on the back.
or is the lug pattern different from the 4x4 to the new 6 lug or do i need to next time i get a wheel off try one of my spares (even though they are 17" or 16"s)
I think gm has used 6x5.5 for all of its products. As for the rear discs fitting, I would reckon its possible but only with fab work.
I have read this thread and it got me interested in doing my own 6 lug rear disc swap. But I couldn't find any sort of bolt in or weld in caliper mounts to make it happen.
Best bet would be to take the whole rear system, mounts included, from a donor 6 lug Astro or truck. After taking pictures and measurements of caliper position relative to frame, rotor, and axle, design a "mount for a mount" to get it in correct alignment. Then plumb some custom brake lines and add a proportioning valve somewhere....
This all assuming the lug pattern, lug size, and wheel offset are exactly the same. Something tells me it can't be that easy!
