You may be due for a tranny rebuild. If it's 2 wheel drive, if 4 wheel drive check transfer case first. On my 4.0l i think the tranny wore out enough that even after a rebuild there is enough wear in the gears for it to go clunk on take off. It's most noticiable when taking off uphill. Although yours being only a 2.3l I can't see the tranny needing a rebuild as long as fluids were maintained. Check your driveshaft U-joints also, if dry they could start squeaking, then get play and go clunk.