Hughes converters?

reason i am thinking of swapping converter is stock one is really inefficient.
it slips about 400 rpm at 60, and it stalls at 1400 rpm.

3.23 gears and tires I have. I should have 2600 rpm at 60, now I have 3000...

btw. Can condition of trans effect how converter works? Stall and slip at cruise?

I contacted to ptc last week. Still no answer, don't know if they even ship to Finland