New tyres caused £1400 damage

gilbert_and_sullivan

Could be a locked rear diff i suppose Adrian but i'm fairly sure mine has to be in low range whcih means auto locked centre diff before the rear diff lock will engage...can't state that with hand on heart mind cos the only time i've used the rear locker is to exercise it to keep it functional.
Either way its very strange what has happened, if the centre diff was locked you can feel the transmission winding on a turn up unless the ground is extremely slippery.

Herzlos

Even then, most modernish switchable ones disengage the diff at about 25mph.

AdrianC

gilbert_and_sullivan wrote: »

Could be a locked rear diff i suppose Adrian

If the rear diff was locked, but the centre diff open, then the difference between front and rear tyres would be irrelevant.

neilmcl

Walkingthepeaks wrote: »

we had ordered the wrong size tyres (255 instead of 225)....do i pursue the garage that fitted, or do I just put it down to a very expensive mistake.

I think you already know the answer to this one.

gilbert_and_sullivan

AdrianC wrote: »

If the rear diff was locked, but the centre diff open, then the difference between front and rear tyres would be irrelevant.

Yes but that could see a broken half shift or worse on the rear axle on a tight grippy turn regardless of any other drive, similar to a lorry driven with difflock engaged in the wrong conditions.

foxy-stoat

neilmcl wrote: »

I think you already know the answer to this one.

The only answer I want is;

Is the OP ever going to come back?

megaginge

Some people are really living in cloud cuckoo land to order something so completely wrong and then try and blame someone else for it ...

londonTiger

are you not supposed to use 4wd mode on the roads anyway?

AdrianC

londonTiger wrote: »

are you not supposed to use 4wd mode on the roads anyway?

Depends entirely on the vehicle, but on the vast majority of part-time 4wds, it increases drivetrain drag, fuel consumption and tyre wear for absolutely zero benefit. And, yes, the owner's handbook WILL explain this in no uncertain terms...

If there's not an open centre diff, or the centre diff is locked, then even with identical-diameter tyres all round, you ARE going to stress and wind-up the drivetrain which WILL make things go bang sooner or later. There's usually something easily replaceable as a "fuse" - on series Landies, with no centre diff, it's the rear halfshafts. Don't even need to jack the thing up to change 'em - the only fun is getting the inner half of the broken one out.

lovinituk

londonTiger wrote: »

are you not supposed to use 4wd mode on the roads anyway?

I'm pretty sure the handbook for an old Mitsubishi Challenger I had categorically stated NOT to use 4WD on drive on Tarmac.