I need a bit of advice here, Recently my brother bought a 77 sebring with a panther pump. He has a mildly built 455 olds which we paid to have installed. Anyways we got the boat back and it was making this vibration thru the hull. We inspected the boat and notice the "u-joint" had some slack in it and that the motor was mounted crooked. Well my brother got into a tiff with the mechanic and he is not going to fix it. So we have decided to do it. My question is this; Is there and special measurements that we need to measure? or making sure the u-joint is straight and level good enough?