I own a 2005 F150 4x2 King Ranch with 5.4L engine and 3.55 limited slip rear end. At about 18,000 miles the truck developed a habit of producing a "chunk" when pulling away from a full stop. The sound and feeling are as if one of the rear wheels fell into a deep chuck-hole in the street. The problem was intermittent, but when I took the truck into the dealership the diagnosed the problem as a problem with the limited slip clutch in the rear end. The replaced various parts and declared the problem fixed. However after the repair the problem returned. The "chunk" occurs less frequently now, but it still occurs 3-5 times a week. Also, a new problem developed after the shop visit. Now I feel a slight buzz in the steering wheel between 36 and 42 MPH. Again, the problem is intermittent, but it is rather annoying. We took the truck back to the dealer, but the dealer reported that he could not detect any problem. I now have 20,000 miles, approaching the end of my warranty. What should I do?

 

my 2005 had the same problem, took it in they replaced the whole drive shaft but i believe the problem was only u joints but anyhow problem solved. had about 4000 miles when it was replaced.