Maybe this will help.
C-6, is a large aluminum case trans. The bellhousing is integral with the body.
Pan is large square with a smaller bump out at the rear.
C-4, is a small aluminum case trans. The bellhousing is seperate from the trans body. Pan is small rectangle.
FMX, is a cast iron case trans. The bellhousing is usually aluminum and is seperate from the body. The tail housing is also aluminum. Pan is square.
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