Fred's right, use a good puller and make sure that you tighten the puller evenly, put some strain on the balancer and then give it a smack with a hammer, should come right off.
"If it ain't Steel it ain't Real" "Earth the insane aslyum for the rest of the Universe" 41 1/2-ton, a work in progress 68 Shortbed stepside 327/325hp/700R4