Im now pushing 250K, 33's, bigger offset and lots and lots of off road work, still no sign of bearing wear.
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On mine, it had just over 200,000 - fronts were fine, rears were noisy and once removed, definately the cause of some of the rear end noise, so no definitive answer on this one I don't think.
Chaybra probably abuses his more than most as he would be the one here that off roads his the most and they're still fine :). Based on that I guess it's just wait. For the amount of work required, I wouldn't bother until they start to make a noise - I've never known one to just up and fail - the rears in mine still had plenty of life left, but were rumbly and had been noisy for 6 months before I did them, so no panic IMO.
Good to know as I have 265,000km up now. I had a strange rumbling from the front left, which disappeared when I swapped tyres. But I'd already bought a full set of bearings by then. I was surprised all bearings were the same part number. Well that's what I was sent.
Been a fan of Scoobys for a while. Me old Mum had ordered one of the first Range Rovers to come here, from Don Fox Motors, but something happened to the exchange rate and she cancelled. I suggested she try one of the then new 1400 4WD wagons from Fuji Heavy Industries. Apart from dampers that had flogged out on the boat trip ( not tied down ) that car was flawless. Horrible little thing, but it just NEVER stopped. She went on to have four more of them. She actually did need the 4WD where they lived. Apart from poor fuel blocking the filters the things were bulletproof.
What I posted about the wheel bearing/CV was true though. They are notorious for being VERY hard to press out.