new 5 speed
 

I just picked up a 5 speed from a 99 mustang gt. I was told it is a "super T-5"

It has a much larger case than the world class T-5. How much hp can it hold? Any ideas on ratios?

Check this out!
Not sure about the -99 GT.
See if You can find it in sidebar on left. "T5 history"

http://www.moderndriveline.com/Techn.../tremec_t5.htm

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I think it is either a t-45 or a 3650 or something like that. It doesn't look like a regular t-5 because I have one of those too.