I've researched this project for myself and I would go either of 2 ways:

1. Thomas body on an internaional chassis powered by a DT466 with wither allison or a manual tranny.

2. GMC RTS city bus with a 5 sp. Allison conversion and highway gears.

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-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250