I helped a buddy replace his while we were R&R'ing the rear axle seals on both our rigs. It's been a while, but I do remember it being a little different than the fronts. I don't think you can just slide those pads out like the front. Since he was tearing into the axle, the caliper had to come off anyways, so we just collapse the pistons and set the brakes pad in the caliper, then slid it back onto the rotor. If you can't figure anything else out, that's a pretty easy route to go.
THANKS!