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I know that 4wd is 4 wheel drive but exactly what does 4X4 mean (other than =16)?
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Jon,
Four wheels, four wheels driven.
You could have a 6x4 which is six wheels with four driven.
David
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Actually there are very few real for wheel drive vehicles ,if you put a land rover with the two nearside wheels in deep mud all that happens is the diff slips and you are stuck.You have to have the diff because if it was not there you could not go round corners.Toyota offered a rear diff lock on some models it resulted in so many gearbox and axle damage they withdrew it.So my opinion is 4x4 means that any one of the 4 wheels can be driven but not all at once
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So 4wd and 4x4 are the same if it has 4 wheels and all are driven?
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My Ram will rip out its drive train if you`re not careful.
The one time I forgot, it wouldn`t turn a sharp corner on tarmac. Or at least there was so much resistance that I stopped and thought about it rather than forcing it.
So, on mine at least, when its in 4WD it locks all the hubs/diffs. And its pulled me out of a mess with only one wheel with any grip - bit sideways, mind.
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If you are talking Chevy Ram it does not lock the intermediate diff and is allowing the front to back to slip.But as you say with one axle locked you cannot steer.
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Say again, I didn`t understand.
Do you mean that each axle is locked, so wheels on the same axle or locked together, but the front and back axle can move independantly of each other ?
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If It is chevy ram 4 wheel drive and you look underneath you will find an intermediate dif which allows either or both axles to be driven
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ah, well, the Ram is in Chile, so I`ll have to wait until I see it again, but I thought it locked front and back as well. In fact, I was quite sure.
Certainly, in some of the most beserk conditions, nothing has ever slipped.
Its a Dodge Ram.
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I thought 4x4 meant either "I've got more money then sense" or "I don't have an image problem any more"......
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I did think of the Mitsubishi GTO, on the grounds that you have to go up, down, or across a steepish hill to get in and out of here, but could I have taken it to TEC meetings?
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Chevy Ram? I think you're mixing your 'Big 3' there Andy.
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I had chevy on my brain and meant Chrysler
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THis is the case with the Ford F-150
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Actually it means "I can take road humps at 45mph without feeling a thing". At least, the RX 300 can. The only thing that holds it up is the woman in front taking the humps at 15mph in her Peugeot.
HJ
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Earlier Land Cruisers VX's, 1990 to 1997 had locking front, centre and rear diffs. But the locking front got left off when they went to independant front suspension, but they still have a locking rear and centre. So in theory they will now have 3 wheel drive. Not heard of any breaking axles though. When they introduced the Range Rover in 1969 they were going to go for a limited slip diff on the rear, but they did have axle problems, so it got dropped just prior to launch. Latest jeeps do have a methoed of locking all diffs, the centre by the usual means, the front and rear with a fluid system whereby any slippage generated oil presssure locking the diff.
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The manual Rav4, which is in full-time four wheel drive, has what it calls an electronic diff lock. Big warnings about not leaving it engaged above a snail's pace. The one time I used it was on a shingle beach, and it restored traction immediately. I have only the sketchiest idea how it achieved this, though.
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Well Martyn, are you 8x8 now??
David
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and why are Subarus referred to as having AWD (all). ??
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The drive system on a Subaru is permanent 4wd, with front and rear diff and a central electronically controlled diff. This avoids problems such as early Volvo systems had if you didnt change all the tyres at the same time.
Since there is no control to manually select 2wd, 4wd or automatically switch between them depending on lack of grip I suppose awd is a reasonable description.
Mind you having flet the delay in some of these automatic 4wd selections working in australian conditions I would take the subaru awd system any day.
Also it sounds more technical than agricultural (probably the real reason but thats marketing for you!)
Ian
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All wheel drive was to emphasise the fact that is was for use on the road (as opposed to off-road)
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