Can you get the full service / warranty history to see if the diffs have been changed?  There were lots of early (and not so early) diffs replaced because of an internal housing coating affecting the bearings (IIRC), so replaced diffs would be a plus although no guarantee.  On a similar but not so expensive note, have the EGR valves been replaced recently?  What's the status of the high pressure fuel pump - is a recall outstanding?  Has the gearbox oil been changed?
				
			 
			
		 
			
				
			
			
				MY21.5 L405 D350 Vogue SE with 19s.  Produce LLAMS for LR/RR, Jeep GC/Dodge Ram
VK2HFG and APRS W1 digi, RTK base station using LoRa
			
			
		 
	
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