2011 F150, 6.2, 4x4, 29k miles. When accelerating from a stop I get a "clunk" noise in the drive train. I had this same issue/feeling with my F250 and greased the slip joint in the drive shaft. It fixed the issue.
Only problem is, my F150 is a one piece driveshaft. Any ideas?
Thanks for the link but I have a one piece drive shaft. Just crawled under it to confirm.
However, when I was under it I noticed transmission fluid leaking out of the front. Most likely the front seal. The first 3 days I had the truck the LS clutch packs had to be replaced as well. Starting to think I bought a lemon. So I am probably going to take it back to the dealer and see what they can find, which is another 3 hour one way drive...
I was thinking that could be it as well. I'll try and pull it apart tomorrow and see what happens. Is the transfer case a sealed unit or is fluid going to pour out of it when I pull the slip joint out?
This is what i think, Most Fords have Backlash in the Rear Differential Case when you come to a stop, not all the time, when you take your foot off of the brake and accelerate you will sometimes get a clunk this is this Backlash that you feel in the drivetrain,I also have a one piece drive shaft
I'm going to drive it back to the dealer this weekend and let them try and figure it out. The clunk is more than just normal backlash due to the one piece driveshaft. My work truck is the same set up but with the 5.0. It hasn't and doesn't clunk at all.
After 2 1/2 weeks I finally have my new truck back. They had to pull the transmission and replace the front seal. Also, they greased the slip joint and no more clunk. Tonight I will crawl under it to get a better look at the transmission. So far all seems to be operating correctly.