Just bought a '92 Safari and there's a noticeable "clunk" sound/vibration. It doesn't happen constantly; once I'm up to cruising speed it seems to go away and the van drives fine. However, I notice it especially when I'm pulling away from a stop (right after I take my foot off the brake). It sounds/feels driveline-related. I read in another thread that it might be caused by the transmission but I wanted to get some other opinions first. Is it something that Safaris are known for (design problem) or that I need to worry about? Is it going to damage other components by driving it this way?