just to respond to TTA89........my point was, I believe the D5 slips when locked under power....and the more often it is locked, the more it slips ( it is, after all, a clutch).......the Vig multi does not slip....it is another gear! If your D5 works, go for it by all means!
I still say locking a single disk Vig (at WOT) is asking for trouble(unless it is a 2200 stall) it is your $$$