Dude, don't you have any sense of humor? My God man, pull the stick out of your butt! It's a fun thread, or it was until you started crying, and, dude, there's no such thing as a 400 overdrive.Seriously, are you jerking my chain?
I can find no pictures of a TH400 that resemble that; and I know of no Chevy engines in the last 50 years that used a bellhousing-mounted starter. And, GM put removable covers on the bottom of the bellhousing to ease removal of the trans or draining of the TC.