I love the OD tranny. It's almost a direct bolt in, turn down the input bearing retainer on a lathe and it fit any Chrysler bellhousing. I've put this tranny in A, B and E bodies now, both slant sixes, 383s, and 440s, and love it.
The A-833 OD tranny has almost the exact same gear spread as the uber-popular GM 700r-4.
Who doesn't like a better gearing for acceleration in first (3.09 first gear vs 2.66), and chopping 25% off your RPM in 4th gear (.76 vs 1.0)? That means less wear on your engine, more mileage, or more top speed depending on what kind of animal you are.
On my Challenger with 3.91s in 4th this tranny allowed me to go from 100 MPH @ 5000 RPM to 133 MPH @ 5000 RPM.
Play with it yourself:
http://www.juric.org/mopar/tools/topspeed.phpOnly reason I'd see not to put it into something if you are doing one of those super-mega restos, or you want a close ratio tranny for autocross or road racing.