A904 has reverse no foward

ok so after some testing the trans does have to come back out, what exactly do I have to do to insure that the kickdown linkage was indeed hooked up right, because unless there was a problem from the time of the first rebuild, I can not figure out what happened, I tore apart the valve body and did not see anything, the air test reveals a much louder air sound in the forward clutch than the reverse, so it may just be a lip seal , but now I am not sure. I ordered a rebuild kit and am going to replace the clutches and steals and any seals.