Sounds to me like a typical stall converter in the 2.5k range, working properly. If you want full blown drag race, it's a good way to go because that all the car is good for. One reason that it's hard to tell that it has a shift kit could be the relation between the engine rpm at the time of shift. Unless you're into it fairly good, the engine will probally shift well below 2.5k.

I don't have a tach, but a good guess for shift speed is 2k--tops, unless I'm into it some. If you have a 2.5k stall in the mix, it gives slush box a new definition. It's probally working fine. If the car has a stall, and he wants to verify whether or not it's correct, he needs to go out and matt it out. That's what's it's designed for and nothing else. Personally, I wouldn't own a stall converter.