Stall and Shift RPM Question.

Dubob said
What's the tune on the engine? You say it wants to creep in gear, doesn't start pulling til 2500 rpm. There's a lot of factors we don't have info on. If the engine needs more timing advance it will effect the way the converter acts at idle along with engine response. There's a lot of other things to sort out before jumping on a major expenditure like a new converter and they only cost time. Not trying to be a butt, just don't like seeing people spend needlessly. I can't find it right now but there was a good thread about tuning and the effect on torque converter. Maybe someone recalls it and will post the link. It was very informative.

There you go. Get back to basics. 1) compression test, 2) leakdown test,

If your cylinder pressure is in the basement, You will need band-aids like gears and hi-stalls.That cam will like a cylinder pressure of 165 to 185. The higher it is, the snappier it will be off the line.
If your TC is creeping at just off idle, its either junk, or junk.
A higher stall TC will not usually make the tranny shift at a different rpm. That is controlled by the valve-body in conjunction with the governor and the throttle pressure.
It sounds like your combo is not well matched. And thats being kind.