How to identify tranny?

The C4 is all aluminum, while the FMX has an iron main case, but aluminum bellhousing and extension housing.. Also, the oil pans that looks like this:

C4
_________|--|
|.................|
|.................|
|.................|
|.................|
|.................|
|.................|
|__________ |


FMX
_____________
|..................|
|..................|
|..................|
...................|
|___________|


Hope this helps. :crazy: