Clunk when in Full Time

[spta97]

It's been snowy here so my gf has had her 06 Liberty in Full Time.

I filled it up yesterday (because the gas tank won't stop when full and spills out and it is not covered under the recall...grr) and I noticed a clunk sound when going forward or reverse from a stop.

She says it always does that when in 4 wd, but it didn't sound normal to me.

I took it out of full time and put it in 2wd and the clunk stopped.

Any idea what this could be? U-joints?

She's got about 80k on the odo.

Thanks!

 

[ftaa]

Where does the clunk seem to be coming from front back?

 

[nullptr]

I filled it up yesterday (because the gas tank won't stop when full and spills out and it is not covered under the recall...grr)

If you want to fix this, check out HOW TO: fix the KJ fuel burp plague. Works perfectly!

 

[CalcityRenegade]

Sounds like U-Joints/Drive Shaft area to me.

 

[spta97]

Where does the clunk seem to be coming from front back?

It sounds like it is coming from the back.

 

[spta97]

Where does the clunk seem to be coming from front back?

Sounds like U-Joints/Drive Shaft area to me.

That's what I was thinking, but curious why it does not happen in 2WD?

 

[CzarKJ]

Check the upper control arm bushings and ball joint. Can clunk if worn.

 

[spta97]

If you want to fix this, check out HOW TO: fix the KJ fuel burp plague. Works perfectly!

Thanks for the link! I read one post that said you can no longer pump full speed - is that the case with you? I'm not sure which is worse.

I've prevented the problem by slowing the fill rate at the last 1-2 gallons and that seems to stop it. I would rather do that then have the stopping issue.

Edit - looks like that was you who made the comment about not being able to pump full speed.

 

[spta97]

Check the upper control arm bushings and ball joint. Can clunk if worn.

Will do once it warms up. Thanks!

 

[CactusJacked]

That's what I was thinking, but curious why it does not happen in 2WD?

In 2wd, the front driveshaft is being spun freely by the front wheels.
But in 4wd, it's being driven under a load by the engine.

 

[TwoBobsKJ]

There's a CV joint at the transfer case end of the front driveshaft (runs parallel to the transmission.) That joint is a known wear item that creates all kinds of noises - grinding, clicking, clunking, humming - and it's a pretty easy fix. Only costs about $50 for the CV joint kit.

As CactusJacked said above, there is no stress on the CV joint in 2WD but in 4WD it's likely the clunking is coming from looseness in the joint.

Check out the CV joint replacement kit here.

Bob