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Ford Falcon 2008: Rattling sound

There's a grinding, rattling noise coming from diff area on my 2008 FG Falcon one-tonner that's done about 161,000 km. I've changed the diff oil twice now, but the noises are still there. How regular would you service the auto?

If you're not sure whether it's coming from the diff or the auto trans you need to get some help to isolate it before you have any chance of finding the cause. Changing the diff oil would have been the first thing I would have suggested if it was the diff, the next would to suggest it could be a bearing, but that needs a specialist to sort it out. An auto transmission expert would say you should change the trans oil every 25,000 km or so, or every year, and there's good reason to do that if you do a lot of towing. They would also say you should do a full service every 100,000 km or so, and again it's more important to do that if you tow a lot.

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