Clunk when slowing down

[Jayman1]

Is it the tool kit under the seat?

 

[dallie.cormack]

I picked my Grenadier up yesterday and noticing once in a while a little clunk I feel and hear. It seems to be coming from underneath by the pedals. Seems to be happening when slowing down for a light. I heard there was a steering recall where Non-locking nuts may have been mistakenly installed on the steering rod ball joint. They said this can cause a clunking but mine seems like not coming from steering. I would think my truck was checked for this at the dealership. Maybe a tranny down shift clunk idk. Anyone else experiencing this? I’ll keep you posted if I figure out more.

I picked my Grenadier up yesterday and noticing once in a while a little clunk I feel and hear. It seems to be coming from underneath by the pedals. Seems to be happening when slowing down for a light. I heard there was a steering recall where Non-locking nuts may have been mistakenly installed on the steering rod ball joint. They said this can cause a clunking but mine seems like not coming from steering. I would think my truck was checked for this at the dealership. Maybe a tranny down shift clunk idk. Anyone else experiencing this? I’ll keep you posted if I figure out more.

I climbed underneath this morning and it took 30 seconds to identify the cause, there is excessive play in the front prop shaft, I can twist it easily by hand which replicates the clunk I hear when slowing.

 

[Dlucky]

Mine is the same, so you’re not on your own. I also have it occasionally when starting off as well. It absolutely sounds like it’s coming from the drivers (lhd) footwell or the left hand side of the transmission tunnel. Hopefully I’ll have time to get under for a look this week.

I have the same clunk too

 

[Dlucky]

After 500 miles in my new Fieldmaster, I noticed a clucking sound between the right front wheel well and the steering wheel (US). It does not appear on highway driving, but side road, lower speed. Sometimes when turning or shortly after.
Intermittent, but more apparent. Curious if this sounds familiar

It’s familiar. Mine clunks when coming to a stop or slowing down quickly. My GWagon did it too.

 

[HereinDaRockies]

I climbed underneath this morning and it took 30 seconds to identify the cause, there is excessive play in the front prop shaft, I can twist it easily by hand which replicates the clunk I hear when slowing.

I doubt that’s the issue..

How is twisting the prop shaft any evidence of problem?

 

[AWo]

I doubt that’s the issue..

How is twisting the prop shaft any evidence of problem?

Could be, could not be. The thing is experience with that particular setup. There has to be play and you can feel it, but how much is normal and how much is too much?
And it takes a lot more experiece for a differential, for example. You have one or more radial bearings, you have gears etc. All add to the play and you can't see them. It needs a good feeling in your hand and good ears to diagnose issues before they become obvious.

AWo

 

[C-Mack]

There will be a stack of tolerances across the entire driveline. You’d have to disconnect each driveshaft CV-joint and use a dial gauge to measure rotational free play at the flange of each major component to test it, assuming of course, there is an available specification to compare the measurements to.

I experienced the same slight ker-chunk noise on downshifts in the lower gears when slowing down off-throttle at intersections for about the first 400-500 miles of driving but now it’s completely smooth. I initially thought it was some kind of problem with driveline tolerance issues having dealt with similar noises on many Land Rovers in the past.

There must be an adaptation process the transmission/engine is going through those first few hundred miles but I could also see how someone’s driving style or rapid transitions between on/off throttle inputs could contribute to clunking or prolong the adaption process. When you think about the considerable rotational mass in the driveline of the Grenadier any rapid changes in torque in the system can produce some backlash noise now and then.

 

[dallie.cormack]

I doubt that’s the issue..

How is twisting the prop shaft any evidence of problem?

Read carefully before commenting “excessive”.

 

[dallie.cormack]

Could be, could not be. The thing is experience with that particular setup. There has to be play and you can feel it, but how much is normal and how much is too much?
And it takes a lot more experiece for a differential, for example. You have one or more radial bearings, you have gears etc. All add to the play and you can't see them. It needs a good feeling in your hand and good ears to diagnose issues before they become obvious.

AWo

The dealer has booked it for two days on January 2, possibly implies a known issue (I suspect the transfer case and/or front diff is out of the tolerance range, I’ll provide an update when fully diagnosed.