I have a 2002 4dr Explorer XLS with the 6cyl engine. How do I tell what type automatic transmission I have? The maintenance schedule that came with it lists several models of transmission that need a fluid change at 30k miles. The schedule also lists other transmission types that DON'T need a periodic change, but nothing I can find under the hood or elsewhere tells what type of transmission is in the vehicle. The dealer is no help at all. They just say change the fluid.