Just got this truck not to long ago. I am noticing a kind of thump noise when i pull away from a stop. I can feel it in the seat almost. All the u joints are good, i kinda of half ass tie the axle in to eliminate spring wrap. I have actually dangled myself from the spare tire with a strap under the truck and had the wife stop and start a few times(now that's trust) and it seems like its coming fro the diff. Its doesn't sound like hard part failure in the diff, but i could be wrong. Are these diffs typically noisy? Is this even something I should be worried about?