Hello Allisonman, The Coast Guard Air Station in Astoria received a new Fire Truck last year on a 2002 International 4800 Chassis. The vehicle has about 3400 miles on it. I have 2 new tranny filters for it. The truck sits most of the time. Is it necessary to change the tranny fluid @ 12 months? It has Dextron in it currently. I would like to change the fluid and filters myself and save on a service call. How difficult is this? This truck is our first out truck incase of a plane crash. How long should I expect this to take? How many qts or gallons of fluid will I need? I see where the filters would go I guess. I have never delt with an Allison before. Just a Twin Disc. What would a service call be to Astoria for this. On a similiar topic I am currently working on my EVT Certification. Does Allison put on a class locally for a guy to go to?