OK, so I originally purchased a 77 passenger 1999 Blue Bird with a 24v 5.9 Cummins with a AT 545 tranny for a good price and just turned around and sold it (wasn't sure if I wanted to do this conversion). Changed my mind and want to take the plunge so I purchased another 77 passenger 1996 Blue Bird but this one with a 12v 5.9 Cummins with a AT 545 tranny. One of the reasons I bought the 1996 is because I know it is pretty cost effective to upgrade the engine (modified fuel plate, governor springs) so it pulls better and I already got a KDP kit to take care of that, too. I also acquired a MT 643 tranny to go behind it (got it for $400). Haven't started work yet but will try and keep ya'll up-to-date. If you have any tips I am open for that, also!