The u-joint on my 88 came right out, WITHOUT removing or even loosening the swing arm. I did need to unbolt the lower shock mounts and let the arm droop to get the old one out. To get the new one in (larger one) I had to gently push the swing arm down so it flexes the heat sheild for the exhaust a little. If you replace a small early joint with the larger later one, be sure to get the later boot too.
Bill
Bill