Mark, definately change the gears first. 3.90's are a great street gear for 400's too. I used to run those gears in a 69 I had years ago and loved them. As long as it's not your commuter car, that is. Otherwise go with 3.73's. I'm running those gears in my 65 with a 455 4 sp. and love 'em. What converter are you using in your T400? What is your total timing set at? What RPM does it come in?
http://home.earthlink.net/~uptons1/ <~~some pics of my 65 GTO
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http://www.youtube.com/watch?v=_qZgOpn-w-o <<< Burnout Video
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"Treat Me Good, I'll Treat You Better; Treat Me Bad, I'll Treat You Worse"
Sonny Barger
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