Clunk when slowing down

[TD5-90]

I occasionally get a clunk if breaking hard and turning hard right. Only doing around 20 mph when I have experienced this noise.

I recently had mine in for service, and they said that this behaviour is known and related to the steering rod problem (sorry, German). No solution.

 

[SCVGrenny]

They did. Their conclusion was that they could not duplicate the issue.

I have the same issue—a "clunk" noise when shifting from 3rd to 2nd gear. I own a 2025 Belstaff with 1,700 miles. I started noticing the noise shortly after the steering stabilizer was installed, just two weeks after I purchased the vehicle. I wonder if those with completely stock cars are experiencing no issues. I have an appointment scheduled for December 22 at the Runsak dealer in Pasadena. If they determine that the problem is inconclusive, at least there will be a record of my visit.

 

[C-Mack]

Most likely the clunk noise is going to vary by vehicle and driving style somewhat (rapid throttle or brake inputs, etc…). Considering the large amount of rotational mass across the entire driveline coupled with the stack of tolerances through the axles, diffs, driveshafts and transfer case which could create enough slack to get the clunk/thunk noise on a downshift as the driveline goes from loaded to unloaded and back between shifts.

I experienced the same issue especially within the first 1,500 miles of driving my Grenadier from new. It seems like some software adaptation by the transmission has occurred as I’ve added more miles but the clunks are still happening but far less frequently and much softer when they do occur. I will certainly bring it up with the dealer but unless this is can be helped with further transmission software updates to soften the downshifts I don’t see this as an issue which will ever totally be resolved. As additional wear and tolerances build up within the driveline it could even get worse as mileage builds.

Sometimes with robustness you have to sacrifice a little bit of refinement but you’d think nowadays that should be easier to achieve. The whole clunk issue reminds me of driving old Land Rovers with spline wear on transfer case input shafts and the like, you sort of end up driving around the issue to keep things as quiet as possible. It’ll be interesting to watch and see if IA recommends any software or hardware changes to address the issue but I really don’t see that happening in a broad sense but more on a per-customer basis based on complaints.

 

[abbeyroad]

I experienced the same issue especially within the first 1,500 miles of driving my Grenadier from new. It seems like some software adaptation by the transmission has occurred as I’ve added more miles but the clunks are still happening but far less frequently and much softer when they do occur / I don’t see this as an issue which will ever totally be resolved.

+1