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Look at the ID plate located on the side of tranny. The M5OD will be marked E87A XX, where the XX is the ford part number. The ZF will show model ZF and perhaps something like S5-42. The casting for the ZF has a raised diamond pattern and the M5OD has a raised rectangular pattern.
Hey thanks guys. I know I should've read the manual and got under there but I always think of these questions at work.(besides the net is much faster here)