Okay, my transmission shifts great from 1-2, but, after it warms up a bit there is no 2-3 unless I manually shift it. And even then at highway speeds it will slip out of 3 back into 2. I've tried running without the detent hooked up and still the same result. It has plenty of fluid, I just replaced the pan, gasket, filter, vacuum modulator, and the intermediate sprag and race. The clutches looked great when I had it apart. I bought it rebuilt about 2 months ago, and then the sprag and race exploded. I did clean out the lines and cooler along with everything else. The only things left that I can think of are the torque converter going out, or a piece of metal from the sprag got caught somewhere. Any ideas or help on this would be greatly appreciated.