Good luck, I called and emailed them and they couldn't tell me what they upgrade.
Like I said, you can spend your money on them, but I would be willing to bet $100, all they do is put in a rebuild kit and do the valve body modifications.
A small shop like Level Ten does not have the capability to make gears, or to cut splines so all those are out. Do yourself a favor and look up their reputation as well.
All of the shops I tried to talk to that had this great upgraded transmissions would not or could not tell me what they upgraded for sometimes several thousand dollars. I am convinced they prey on the people that don't know anything about automatic transmissions, they get an old worn out trans put new clutch packs back in and do the valve body and "OMG this is the best transmission ever!"
Oh and by the way the Transgo kit, comes with different springs and different sized drill bits, so all of this "We carefully select the spring weights, orifice sizes and location, valve size, and port modifications" are in the instructions of the $100 kit. lol.