I am using the same hub that Wayne Schell and Jim Shepard used to drive the enging to right angle box. This way the pullys can be moved in and out to get the best alignment. These are not available so I made it close to their design.
I decided to use a right angle box from hub city. The Eagle factory box is much lower hp rated.
The drive shaft came in at 20" which is a few inches longer than the old one. The 4000 allison is shorter that a 740 which allows the longer shaft. The tranny comes with an 1800 series yoke which is bigger than the 1700 the bus came with. We may need to turn the rear yoke down a little for a little more space.