158k on an '06 Caravan, big 6....... . When shifting from 1st to 2nd with a bit of throttle, it sort of clunks in. the more acceleration the more the clunk, also when turning it seems to clunk a bit more as well. The higher the Rs the more disturbing the clunk. If you're ultra easy on the peddle at lower Rs, it hardly clunks. Is it worn gears, differential, loose something or other or what?