I did a J30 on an S13 and it wasn't too big of a deal. Jack stands, 3 ton jack, 12mm, 14mm, and 17mm(?) wrenches. Paid $200. If I recall correctly, the S14 and J30 both mount the same (unlike the S13), so it should be that much easier.

The problems come when you start playing with the gears and shims. SCC says that it'll probably be fine without adjustment. That's just a nice way of saying that you *might* f-up your diff.

Chris