200R4 update

I drive this car a lot. It is a 500hp daily driver for the most part. A 408 wouldn't last a month at those high constant rpm's. I didn't want a manual valve body. I have a very nice ratchet shifter and can manually shift if I want, but in highway or traffic I am happier letting it do it's thing. And it gets better mileage that way. Since I tuned it up I run about 6 mpg, so I'll take any gain I can get. Your 904 is nice, as was mine, but in the end it is only a 3 speed. I have 4.10 gears and needed another gear, plus the 200R4 is better geared all through. I have spent a ton of money on this car, and this upgrade is by far the best thing I spent my money on next to the big motor. It is well worth it whether driving on the highway or not. I recommend it to anyone.