I think you're talking about their modified T5. I researched that same transmission for a 65 Mustang I'm building. My problem with the regular T5 was that it couldn't handle the power. McCleod's T5 seemed great for over 400hp, but other options were also available for the money.
I think there's is ready to go, stronger gears with their own case (which was weak on the standard T5's).
Sorry though, no experience with their transmission...just research.
1967 FB 400 4-speed A/C Tyrol Blue w/ Dark Blue 1967 GTO 400 AT A/C Gulf Turquoise w/ Black (dad's 1st car, my last car)