It could be even simpler if we wanted to get a group buy on having a custom ratio for 5th gear made.
Personally, I have been knawing over using a TKO600 when this one fails. I have a friend that powershifts the living hell out of one all the time. He makes 462whp on my dyno and has no less than 400wtrq from 2800-5600rpm. (408sbf in 88stang)
I also will be considering the STS-V 3.42 rear, pending on 1st gear ratios.