I just had my th 400 rebuilt, but I don't like where it shifts. it shifts out of first at 20 mph, then out of second at 36 mph, how can i raise the mph where it shifts, I would like it to shift out of first around 30mph and second at 45 mph. also if I am driving faster than 36mph and floor it, it won;t kick down into pass gear, if I am driving less than 36 and floor it, it will shift down. is that normal?? what needs adjusted?