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Discussion Starter · #1 · (Edited)
2008 4x4 CC just turned 140k and recently noticing this weird clunk. its apparent when coming to a stop and especially down a hill. happens , but rarely when just driving straight /planned- like coasting and then suddenly stepping gas..clunk ckunk..

most recently replaced Ujoints and driveshaft carrier bearing.
definitely comes from center of truck underneath.. coming to the stop like 15..10mph and slowing it kicks in.. clunk clunk clunk and by the time I stop smd listen it stops. I can't seem to duplicate the noise in nuetral..... shhhhiiiiii....

any ideas? finally at the point where the truck is asking for money. always did regular maintenance like fluids and brakes getting alignments and tires. recently did the work mentioned above and some front suspension stuff as well.
 

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Shot in the dark:
Are Utilitrack plastic bed rail inserts installed? They can slide fore/aft and make a clunking sound while stopping.
 

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Discussion Starter · #3 ·
Shot in the dark:
Are Utilitrack plastic bed rail inserts installed? They can slide fore/aft and make a clunking sound while stopping.
yeah the shot in the dark isn't crazy.. recently had a terrible squeak that was FINALLY figured to be the hood's dump stops being dry ..

but yes I have the bed thingy inserts but it's 100% not that. this is a real dunk. dunk type clunk. was duplicating it earlier tonight.. sometimes it's a random *duunk* like going from coasting to accelerate..or downshifting or ,coming to a stop (but before truck is stopped) it's more of a clunk, 3 times or so.. getting softer each one
 

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Simple removal for certainty. Good luck troubleshooting.
 

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Discussion Starter · #6 ·
Did you properly tighten your sway bar and check the links for wear?
not a bad idea, but this certainly isn't the sound I'm experiencing. every time I go duplicate n evaluate it further it just seems it's a trans issue but I'm still holding out for a cheaper part , that isn't the xfer case
 

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i had this issue with my 98 and it was the carrier bearing. but it appeared fine.. I removed he back half of the driveshaft to take the load off it and drove around Fwd and it eliminated the rear strain which pin pointed it.. BUT you have and 08 and i too have a 07 and there is no carrier bearing on the drive shaft lol i would say remove rear drive shaft and try but it would puke ATF all over the place unless you have an extra yoke to slide in .. i would get the rear end off the ground and try to mimic it.
 

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Discussion Starter · #9 · (Edited)
i had this issue with my 98 and it was the carrier bearing. but it appeared fine.. I removed he back half of the driveshaft to take the load off it and drove around Fwd and it eliminated the rear strain which pin pointed it.. BUT you have and 08 and i too have a 07 and there is no carrier bearing on the drive shaft lol i would say remove rear drive shaft and try but it would puke ATF all over the place unless you have an extra yoke to slide in .. i would get the rear end off the ground and try to mimic it.
can't seem to mimic it on the lift or pushing on the ground . I just had the driveshaft bearing replaced too..I don't think it was a Carrier bearing, I think it was a bearing in the center of the rear driveshaft.

new update today... it also occurs when I'm pressing on the accelerator and I will stop somewhat swiftly to make a turn..and the trans wants to downshift (I guess) and then I get the knocking while slowing down/downshifting



I have a great transmission guy but I can't afford that work right now after I did the rest of this stuff.. so I'm avoiding that until it breaks down I guess. uggghhh


update again...just hopped in the truck -it was warm already- shifted into reverse and heard the clunk. BUT it's not the clunk from the 90s [Ford] trucks when u shifted from R to D(vice versa) ...it's a similar sounding clunk but I'm also experiencing it while driving so ..I don't know..
 

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Discussion Starter · #10 ·
Maybe your output shaft bearing is worn, allowing your rear driveshaft to have extra play. That play plus the copius amount of driveline slack that these trucks have from thr factory could cause some noises when power is applied.

Who knows...
this is the part on the driveshaft I just replaced. even before it was replaced I only had slop in the driveshaft from work Ujoints (fixed those too- no more play)
as of now the rear driveshaft has zero play in any direction. so stumped here...
 

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Discussion Starter · #11 ·
*new update*

did some driving for the past two days and was able to duplicate / test the sound further. When I throw it into neutral as soon as I hear the sound it's a clunk that kind of turns into more of a clicking while in neutral. If I sense that the clunk is about to start and I accelerate instead of continuing to stop, the sound does go away on acceleration but when I start to slow down again it finishes the last few ticks..


does anybody at all have anything else that I can be looking at in checking or have experienced this before. I have already checked and replaced most of the parts on the drive shaft and in the front suspension
 

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Auto trans?

( Suggestion: having just the minimal info about your truck in your signature is really helpful for those of us who want to help you. It beats having to read back through the thread each time trying to glean the needed info.
.02 / :) )
 

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Discussion Starter · #13 ·
Auto trans?

( Suggestion: having just the minimal info about your truck in your signature is really helpful for those of us who want to help you. It beats having to read back through the thread each time trying to glean the needed info.
.02 /
)
yes. I almost wish it was A5 speed because this would be easier to diagnose not to mention a hell of a lot cheaper

oh yeah, I'll have to change my sig now
 

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I would re-investigate the u-joints and probably take the rear diff cover off for an inspection before moving on to transmission issues. Can't hurt to check the front prop shaft as well.
 
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