All this converter talk.. but focusing on Stall speed.. There's so much more to a converter than stall speed. Ivans converter is a smaller diameter converter, it was previously done by someone else, but it chewed up a bush, or the lockup mechanism up (more likely to happen with a smaller diameter convertor than a bigger one). when it was repaired, it was altered a little as it so it wasn't as swashy. Overall, its a pretty good converter. It has VERY good drive in it.. so its not just all revs and minimum drive, which I find very important in a daily vehicle. I know I had a number of combinations done with my converter before we were all totally happy. Although, mY converter is still the original sized ford unit.