<Li> Pupil Transport / Shuttle Series </Li> <Li> Rugged Duty Series </Li> <Li> Truck RV Series </Li> <Ul> <Li> 1000 Series </Li> <Li> 2000 Series </Li> <Li> 3000 Series </Li> <Li> 4000 Series </Li> <Li> TC10 </Li> <Li> Torqmatic Series </Li> <Li> Off Highway Series (5000, 6000, 8000, and 9000) </Li> </Ul>

When did the 6 speed allison come out