Ok I was directed here by v6z24.com to find someone on here who builds the TH125C transmissions for high horsepower and torque applications. He told me to come here because there is a guy on here who does this. Does anyone know of who does this? Can anyone lead me in the right direction? Thanks in advance.

Well, I don't do the work, except for my own, but I can direct you in the right direction. Just read the following posts:
Stock Torque Converters, 3 Speed Gears and more
3 speed auto, finally done and finally installed.
questions about the 3t40

These are but a few of the posts concerning building up the TH125C/3T40. You can also use the search button at the top of this forum for more info(yes the search button can be a PITA, till you learn it's idiosyncrasies). If you can't find it there, just ask.

Hope these help!

hey, thanks for the help. i really appreciate it.

I would look up a Fiero site for people with hot rodded Fieros. They use 125C's with Chevy Small Blocks and s/c v6's