I have this transmission with no gears or anything, at least I think as Automotive has always been a weak area for me. I used the magnet test and it sticks to the pan on the top right corner(probably meant to be on the bottom, just pictured this way) and not the main body of it. I read that they make these out of cast aluminum and cast iron if I recall correct. Will a magnet stick to cast iron? I looked up the model number several times but was unable to get the exact makeup. It is an Aisin aw co. model no. 03-71. Any input appreciated! I read cast aluminum has a good return. Not sure of cast iron. If it is cast aluminum what would it be graded as being?