I'm pretty sure there's a driveshaft, but it's only a few feet long. Even though the engine is right there, there's still motion in the suspension that will alter the geometry (and therefor the length) between the engine and the axle. That's usually solved with the driveshaft, and custom driveshafts are relatively simple to make - moreso then custom engine or transmission mounts. You also want an easy way to make the bus freewheel if you need to tow it.
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