actually, the Explorer guys say that the early Explorer 8.8s have the same shafts as the later models. :thumbsup: (except maybe some very early production 91s) the only real difference is that the early ones have drums and the later ones have disks. and if I remember right, the explorer disks are easily swappable. I've got no idea on the thunderbird ones though.
also, there is no internal difference between the explorer 8.8 found behind a v8 and those found behind a v6. don't pay extra for one with slightly different bracketry (that you're going to cut off anyway).