As far as I've been able to determine, that's the way it works if your stall speed is too high. You really only need a high stall if your engine doesn't make any low end torque, like if you have a huge cam. Smaller engines often will use a higher stall speed as well. GM converters I've found can come with a stall as high as about 2100, and stock regular for the 1stgenv8 i think is about 14-1800.