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Sounds normal to me. I describe it as a ‘graunching sound’ at low revs, which disappears as soon as revs pick up a little. They (TD42’s) all do it. When I bought mine I had an RACV check done which came back saying the car had gearbox problems. I then had it checked by a 4wd transmission specialist who smiled, reassured me that it was a Patrol thing & told me there was nothing wrong with the transmission. Recently my wife did a 4wd training course in my car, & whilst out with the instructor he commented “Ahh that vibration/noise reminds me of the Patrol I used to have, I miss it”.
2006 4.2TDi ex-Telstra Remote area Camper. Patrol Sold after 11 years of ownership Replaced with 2006 OKA NT Expedition Truck. Cummins, Allison & lots of goodies A Nomadic Life (Blog)