[TEXAS-HOTROD]

I can maybe give you some ideas to think about (if I'm not too late), but no actual solutions.
I noticed that the o.d. trannys in the Ram trucks have a case that looks like the 727 but with an additional housing bolted to the back of the case. It looks like the engineers at Dodge used the old castings and added an o.d. unit to the back (pretty slick).
I would have to research the electronics, but if the transmission uses minimal e.c.m. inputs for shifting duties, a Dodge o.d. trans might be the way to go. If the o.d. is actuated by a single solenoid, maybe an on/off switch could be wired in.

I have rebuilt countless G.M. trannys (mostly 700R-4 o.d.) and w/the differences in bolt patterns, starter designs, Dodge using a ring gear on the torque converter, and Chevy having the starter drive off of the flywheel, it would be too much work to make a Chevy mate to a Dodge. I'm sure it could be done, but pretty costly.
Option #3: contact Gear Vendors and see if they make a direct/over drive unit for a 727. They run around $900+, but are pretty much a bolt-on (is there anything that is truely "bolt on"?).

Sure Grips have beefy internals. Those things are stronger than a Ford 9". I have a S.G. that has 3.25s in it. I wouldn't sell it either, those babies are hard to come by. I'm sure one of my projects will need it.

Hope you get it figured out.
---TEX---