I have dealt with Gray and American Powertrain a fair amount. I bought a TKO extreme, and a Clutch set up. I use them on my 1965 GTO, 600hp, driven everywhere and has a best quartermile of 11.34 @ 123mph. They have been great to deal with and Gray is great to deal with, and has great technical knowledge.
I would highly recommend them, hope this help!
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