700R4 GM in a Swinger?
Yeah, the Keisler one was an upgraded version rated at (I think) 650 ft-lbs. It was actually the GM 4L60E.
The 4L60E can be retrofitted with better guts to make it a 4L65E. The other advantage to this trans is the lower first gear ratio. I built one of these for a 94 Blazer, and it did very well. There is a servo upgrade for the front band, which is a step above the Corvette piece. I don't recommend against it, but when we put it in a case for a 98 K1500, it blew out the servo housing from the main trans case. It hits hard enough that under light acceleration, it will chirp the tires on 1-2 shift. This could be toned down by playing with the line pressure servo motor.
Overall, its not a bad trans. Two weak points that stand out in my mind are the OD clutch, which tends to burn (the "65" upgrade should take care of that) and the overrunning clutch that lives in the middle of the clutch drum will give you headaches if its slipping at all. The other thing is that its "new" tech, which means no more cast steel drums, and all aluminum and stamped steel drums inside. This means less rotating mass, but may also mean less ability to handle large hp/torque. The Corvette version of this trans had a separate bell housing, which means a bell for SB Mopars isn't very hard to make.
Only other downside is the electronic controls. The Mopar trans is easier to wire in, but will require manual switches. The 4L60E wiring, a place like Keisler or Phoenix should have this handled. That, and its not anywhere near as easy to rebuild. I can tell you about some special tools I made, if you decide to go that way.
I've toyed with this idea myself, but I'd have to do it undercover, since I'd never live it down with my friends.
