Will not shift out of 1st

Ok, fluid level is good. I adjusted the kickdown several times. I tried setting it so that the level reaches its full travel when the throttle is wide open. I then gave it a little more slack then that. 3rd, I unhooked it completely so the level never moved. The trans still will not shift. I can run it up to 3000 rpm being easy on the gas and it will not shift. What's the next easiest thing to check?