Thanks for your time jpar, I've read hundreds of your post on numerous topics and while I'm no expert, it's obvious that you're one of the more knowledgeable active members on this site. Honestly, all I've been doing since I got the car back in February is reading and more reading. Partly because I'm not yet financially able to do much of anything with the car and also just to aquire as much information as I possibly can. While I'm always the first to admit I'm not a mechanic I am old enough and smart enough to realize that not every thread I read is 100% fact. It is nice however to get several different opinions and come up with a reasonably accurate conclusion. I also realize nothing will replace hands on experience, but I'm just simply taking my sweet time enjoying the game planning phase I'm in at the moment. As I've mentioned in some of my post, the car is a lot of fun to drive in it's current state. What bothers me the most is on the freeway at 70 mph it is really working hard, wish I had a tachometer! Obviously smarter to hit the track, but I love to fly down the freeway at ticket speeds when it's not rush hour lol! It's like therapy for me and it always has been when I'm in a Mopar. I've gathered the 904 with the right parts would be just fine for the 450-500hp I'm shooting for, I just want some top end without beating the hell out of the engine, and came across the whole overdrive idea thinking I could have the best of all worlds. I was just noticing yesterday while reading and researching exactly what you're saying about the price difference or lack thereof between the Dana 60 and the 8.75 differentials! You're right again LOL! I've read a lot of guys also mentioning that the Dana 60 is too heavy for my little 71 Dart Swinger. I'm not worried about shaving seconds off my quarter mile time, I just want to build it right and build it once.If it costs more and takes longer, I'm okay with that. Thanks for your time!