I can happily state that the slipperential fits the D8 with minimal modifications. It took quite a few diff shims, the bulk of witch I placed at the front to minimize the forward movement of the spur gear that cut down on the amount I had to grind the chassis plate to accommodate the gear and thrust bearing. It also required a little dremel work to the diff top brace.
There isn't a race this weekend so I won't post a review until Monday a week. Anyway here's a couple of pics.