OK, T5. Thanks! Hard to remember it all when you have CRAFT.
I did some digging on the net about T5s for lower HP trucks. T5s were built for a lot of applications. Many were low HP, and so smaller gears are used inside. Some, like Camaro, etc, were high HP.
If you're gonna run a blower, etc you might want to consider a Richmond Gear 5 or 6 speed. They're built for serious HP and abuse.
There are also some aftermarket folks advertising rebuilt-to HD-specs T5s. Start googling, do your homework.
Cheers!
George