Ain't gonna happen easily : ( Had the chance to crawl under one last night, and measure the axle flange vs my '86 10 bolt. 2000 has a 3.5"x3.5" 4 bolt pattern, the '86 has a 3"x3.5" Axle flange is rotated 45 degrees, but that probably wouldn't matter much. Looks like plenty of clearance to run a 15" wheel though, if you wished. E-brake comes off the rear of the backing plate, so it loops forward over the axle. Appears you couldn't just re-drill the backing plate, (bolt holes would be too close together) but perhaps with some grinding of the edge of the axle flange for the slightly different bolt pattern, and a plate custom made to bolt to the back of the stock '86 flange, plus two additional holes in the "adapter plate" for the wider disk brake backing plate bolt pattern, it would bolt up. Sounds like a lot of work though, unless some company mass produced them. On top of that, the e-brake cable would then point at the ground, or straight up, which might cause some problems as well. Perhaps some of the trucks 88-up were still using the same flange? Anyone know when rear disks were first offered? If GM made the disks for the "earlier" flange pattern, it might be a direct swap. I did notice that the "triangles" on the lower edge of the diff housing on the newer trucks, has been changed, but that probably doesn't indicate anything. Dorian My tech/links page: <a target="_blank" href=http://www.dorianyeager.com/index2.html>www.dorianyeager.com/index2.html</a> Why insist on counting when the ring gear has the tooth counts stamped in?