My '99 250SD has a bit of a "clunk" when bouncing around hard. Sounds like in the tranny/tc. I have crawled under it and checked out all I can figure, no luck. So to the tranny shop I go, only to hear them say it is pretty normal for Fords. Says they tend to have more gear lash, hence the "clunk". I dont like the feeling my tranny is going to shell out when 4 wheelin. Any sugestions? It does shift fine, and does great in all other situations.Thanks