Dealer already put 3 pigs in my rearend, for whinning noise at 52 mph & still is there but not as bad, they also geased the drive shaft going into the transfer case they said ford said that would cure the clunk, well after 2 months it is doing it again, I take off from a dead start & it makes a clunk in my rear kinda sounds like the leafs doing it from the movement , but I dont like it, what do you guys think, Thanks Mike S.

 

When they changed the "pigs" () did they change the clutch pacs in the LS? Mine was doing that (as well as a lot of others with 04s) and thats what the problem was.

 

mine clunks if i let off the gas say to turn and the hit it to accelorate again, it clunks. sounds like right under the floor.

 

I had the same problem but when I had my new driveshaft built it stopped. .

 

You need a NEW driveshaft... Mine did the exact same thing, clunk on takeoff... I looked up TSB's, and sure enough there is one for this issue... It states that it is OK to lube it if there are no shavings on the spline.. But if there are metal shavings (like there were on mine), then the entire driveshaft must be replaced... You need to take it back to the dealer and have them follow the TSB by replacing it, not just band-aid'ing it by lubing it again.

 

I read in a magazine that the newer trucks that sit so high up in the back are all having this problem....all companies included.

They said that when braking the rear of the truck lifts slightly and puts a tougher angle on the driveshaft, leaving it no choice but to slide out of the tranny slightly....then when accelerating from that stop, the driveshaft slides back in and WALLA!..."CLUNK!"...

That's what I read and, to me, sounds like a logical answer....IDK tho..._motes