Rear suspension or axle clunk when getting on or off the gas.

[atikovi]

New to me 2006 6-speed with 180,000 miles. Whenever I even lightly step on the accelerator or take my foot off it, I hear and feel a clunk from the back like some suspension bushing is loose, worn or missing. Even parked in the driveway I can look out the door when letting out the clutch and actually see the axle moving slightly when it clunks.

Right now I have the rear up on jack stands at the frame so the axle is free to hang down. I tried using a pry bar to move things around and hopefully see what's loose, but got nothing obvious. I know these models had a recall for lower control arms, but the recall is not open on this truck so it was probably already done. The upper control arm looks pretty clean but don't know if it was replaced 1 year ago or or 5, or if it's a cheap low quality part.

Two unusual things I noticed. With axle hanging, I can move the coil spring around. And I can lift the axle up by hand almost an inch with no resistance. Is the shock bad? What else to check?

 

[u2slow]

Upper arm bushings. They tear. Best viewed when not jacked up.

It is very difficult to remove the OEM bushings without stretching the holes (then new bushings won't stay in place.) As careful as I was, still had to tack-weld the new Moog ones in. They didn't last long either, so I swapped over to another used arm.

 

[duderz7]

Jack it up by the axle so it's closer to ride height during inspection. The bushings mentioned would be a good place to start, next the ball joint on top of the diff, check for play front to back. Also loose shock hardware or bad bushings there. Lower arms, and I joints at the drive shaft. Any of the could be clunking. I don't suggest trying to replace bushings or ball joints in the original arm either as mentioned before. Axle movement is not necessarily bad, keep in mind it's only rubber holding it in place. Oh and the loose spring at full extension just means you need new springs and shocks because they're worn out.

 

[atikovi]

OK I'll take a closer look tomorrow.

 

[KJowner]

The arms are made of tinfoil, however if you spilt the old bush outer sleeve with a hacksaw you can knock them out without wrecking the arm.

 

[atikovi]

The arms are made of tinfoil, however if you spilt the old bush outer sleeve with a hacksaw you can knock them out without wrecking the arm.

Who sells the bushings? I don't see them on Rock Auto.

 

[KJowner]

I bought them off Ebay.

 

[u2slow]

Who sells the bushings? I don't see them on Rock Auto.

Moog K200428
Mine were from rockauto, and they still have them.

 

[atikovi]

Moog K200428
Mine were from rockauto, and they still have them.

And they come two in a box? I don't know if the control arm is OEM and if the aftermarket bushings will fit aftermarket arms.

 

[u2slow]

And they come two in a box? I don't know if the control arm is OEM and if the aftermarket bushings will fit aftermarket arms.

Each. One per box. I will never buy them again.

I got a whole arm from rockauto for $74. Amazon wasn't far off that price either.

 

[atikovi]

Each. One per box.

That's odd. At the Moog site it says 2 in a box, https://www.moog-suspension-parts.com/moog-k200428 and $13 at Rock.

Question:Does part number moog-k200428 come in pairs or singles? Answerart number Moog-k200428 comes with a quantity of 2 bushings per box.
Question:K200428-Control Arm Bushings- Could you please let me know, does the following part come with 2 bushings in the kit or 1. In other words do i need to buy 2 x kit of 1 x kit. product id: moog-k200428 rear upper control arm bushing - at frame Answer:Moog-K200428 comes as a pair of bushings per kit.The information I have show you will only need one kit for your vehicle.

 

[u2slow]

My invoice from 2016 says I ordered 2 units. Don't recall having any extras.

Good luck