It's one of three: AOD, E4OD or a C-6. The AOD is stamped "Metric" on the pan. The C-6 is a three speed auto. The E4OD is a humongous 4 speed transmission that holds 4 gallons of oil.
its a four speed and its a huge thing. was told that this is the trans they put in the 3/4 ton. when my dad brought the truck from a ford dealer they called it a heavy half. so maybe its a e4od
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