05 F150 XLT LS REAR END, DOES ANY ONE HAVE A THUD NOISE COMING FROM THE REAR OF THE TRUCK WHEN STARTING FROM A STOP OR WHEN TURNING FROM A STOP.
IT DOESNT DO IT IN REVERSE OR WHEN IM ON A HILL? ONLY WHEN I TAKE OFF AFTER STOPPING

 

could be the slip yoke.

there is a TSB on this for adding more lube. Do a search on slip yoke in theis forum to get more information.

 

I Bet All The Problems They Are Having With The Slip Yokes Is That Thet Are Not Machined Correctly.

 

someone here suggested they were using the wrong lube (bearing grease vs teflon grease)

 

i have the same problem but the dealer says they cant replicate it so that sucks next time i go up there im gonna get poed cause i hate that dealer lol

 

There have been lots of discussions about this problem on this site. Search for them and you'll find some good info. I've that several people have had this problem. The teflon lube will stop the problem for a couple of months, but I hear that it comes back. However, seems I read somewhere that someone did get it fixed ... required dealership to do some type of service on it ... don't remember exactly but it is in a discussion thread around here somewhere.

 

Could be clutch packs or a combination of Clutch Packs + Slip Yoke.

Clutch Pack Search

Clutch Pack 1

Clutch Pack 2

Hope you get her fixed!!!

 

I have it too. Seems less noticible w/ recently installed tuner for some reason. . As far as I know it dosen't hurt anything, plus it supposedly comes back shortly after greasing the yolk. I have a severe case of " fear of the dealer" so I'm not bringing mine in.

 

ford's been having problems with binding slip yokes for ages. It is not a new to f150 problem... Do a little research, and you'll see. if it was a simple machining problem, they surely would have gotten it fixed by now...

 

Where the hell is the slip yoke? I should know this but for some reason I don't. Anyone have pics of it? Any pics of after the "lubing" of it?

 

It is the shaft exiting the transfer case that the drive shaft attches to.

 

The thing that is concealed behind that black plastic cover thing?

 

The slip yoke is contained in the cone shaped "tail" where the drive shaft is attached to the transfer case.

 

I went through some of the same with my 04 fx4, the rearend would chatter during take off and tight turns it would vibrate on the highway some times (at all speeds) seemed thight, had it to the dealer 3 time they of course could not duplicate the the problem, the fourth time I told them it is doing the same thing my 77 transam did when the ls went on it they of course could of cared less I asked the service manage to have one of the tech ride with me well it happened the truck shuttered on a tight turn in there parking lot and he said that is commen I told him for $35000.00 it wasn't, well after a breif disscucion with the sservice manager they ordered a new clutch pak for the rear diff had it installed last week its like having a new truck again. All the problems are gone even some I thoughtb where normal..

 

I have an '05 SCREW 4x4 Lariat and it does the same thing. I had noticed a couple of times before and just ignored it - but Sat. it sounded as if I had a package in the rear seat that had just fallen to the floor - the thump was that loud. This was just as I was taking off from a stop and - I even stopped, got out, opened the rear door and checked the floor area, under the seats and even the bed to be sure something I'd forgotten about hadn't fallen over.....nothing was there though!! Guess I'm gonna have to go face the dealer over this - but it doesn't happen all the time - so I hope I can recreate the noise.....