I would rather have a super strong T56 than an automatic tranny. I want it to handle over 700rwhp and hard clutch dumps. But I like the double overdrive to get the highway fuel economy. I want my car to be an all around street machine and drag racer. I looked at a 4L80E and Gear Vendor's Over/Underdrive unit to get the same effect, but that would all cost over $6K. If I get a Street Twin Disk clutch, safety bellhousing, and all new hydraulics, I would have a budget of up to $4K for just the tranny. I would maybe spend the money for a fully billet internal T56, carbon lined synchros, and heavy duty case. What do you guys think?