A month or so ago I noticed a repetitive "clunk-clunk-clunk" coming from my front end when I engage 4-wheeldrive. The frequency of the clunk is directly proportionate to my speed, but only occurs when under load. Decelerating, coasting, or rolling in neutral does not produce the sound.
I have a 2001 Dakota SLT with the 4.7L and manual 5-spd. I now have almost 120K miles on it. I have been taking the pickup to JiffyLube since I put my first 3K on it, and it has received every service that pops up on their computer since.
Any recommendations or plan of attack for this problem?