I use an AOD but a C4 will fit the trans tunnel with no cutting or very slight mods with a BFH (Big F'n Hammer)to the front of the tunnel. The AOD is a 13" Converter so the bell housing is huge, the C4 is an 10 or 11" Converter so the bell housing is much smaller. yep that's the factory location, I was able to locate the 6 holes on the back of the factory frame mount then added the wings on the front of the flat bar to put the other 6 bolts on it. The front middle factory nuts are stripped so I didn't put bolts in as I figured 10 bolts would hold it in.