The ones pictured above are from trash trucks... The airport tugs use a medium size Allison and they are breaking the cases quite often since the tugs essentially don't have springs/suspension...
I think to get an Allision in a FORD your going to have to shop for a F550 and up, I really dont know BUT I know. I have a guy for that...
"The 2016 F-650 and F-750 trucks, which will go on sale in the spring of 2015, will be assembled at Ford's plant in Avon Lake, Ohio, and feature chassis, engine and transmissions all built in-house.
For years, the two vehicles were built on chassis made in Escobedo, Mexico, under a joint venture with Navistar, using diesel engines supplied by Cummins and transmissions supplied by Allison."
Personally I would pick the version JBS hasA Cummins engine and an Allision trans should be a stout and reliable combo for a LONG time...
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