I was just reading this for fun and have no overdrive info to add but I feel I need to plead with you to NOT put a Ford 9" in your Mopar! You have an 8-3/4, 9-1/4, and Dana 60 to choose from so there is no reason in the world to put another brand of rear end under your car. Please don't be that guy!!!
The 9" is a great option for many of us, I had one in my 9 second DartSport. They are durable, have a drain plug in the bottom, a removable center section carrier, and a much wider variety of gear ratios, especially for highway type gears.
I also had a Dana in my '69 Dart and I liked the 9" alot better.
I love my Mopars and Mopar engines but I could care less where the tranny or rearend came from. A turbo400 and a 9" is a perfect combo.
