Geraint
Member Since: 15 Aug 2005
Location: Warwickshire
Posts: 18
  
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A long tale shortened.
My front diff was replaced under warranty last year following a common failure of the internal coating resulting in wear issues. Sometime later I experienced severe temporary drivetrain vibration for a short while on returning to tarmac after being off road, particularly if I had just put two wheels on the verge and accelerated away onto tarmac.
After a few returns to the dealer they eliminated the flywheel, clutch, gerabox and transfer box by replacing them all...YES REALLY!!!
I had described the vibration as like axle wind up as experienced on my 1953 series one landrover when it has been left in 4WD on tarmac, and I queried the new diff, but was told there was no way it could be wrong...well it turns out after six months that they have put the wrong diff ratio in the front, and the front wheels are turning at a different speed to the backs.
The vibration was caused by the front wheels scrubbing when the centre diff has locked itself on the slippery stuff and I returned to tarmac, and stopped when the diff unlocked itself. The rest of the time the centre diff was working its socks off compensating for the front/rear missmatch.
This should serve as a cautionary tale.. it is worth checking the basics, even if the dealer says it cannot be true.
It is now being taken in on Monday for a new front diff, and after a bit of pressure a new centre diff to replace the one that has worked so hard. One thing proved though, if the centre diff can cope with 9000miles of different diffs, slight tyre mismatch with worn fronts and new rears would seem to be no problem
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 9th Jan 2010 10:42 pm |
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caverD3
Member Since: 03 Jul 2006
Location: Oberon, NSW
Posts: 6922
 
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How did they discover it was thw wrong one? “There are only three sports: bullfighting, motor racing, and mountaineering; all the rest are merely gamesâ€
Ernest Hemmingway
D4 3.0 Active Diff, Adaptive Lights, High Beam Assist, Surround Cameras, Privacy Glass.
D3 2.7:Adaptive Headlights,Electronic Rear Diff,ARB Bar,Blaupunkt Speakers,JVC Powered Subwoofer,Removable Snorkel,Mitch Hitch,Pioneer After Market Head Unit,Steering Wheel Control Adaptor,Remote Adjustable Supension Rod System, Taxside Dual Battery System.
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| 10th Jan 2010 1:28 am |
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Dickydisco
Member Since: 03 Feb 2009
Location: Colchester
Posts: 501
 
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why different ratio?
Do the V8 have different to the V6? are auto diff to manual?
thought they were all the same Current: D3 commercial
Past: but not forgotten D3 HSE x2, 5 TD5 disco2's, 1 200tdi disco1, 2 300tdi disco1 one of which was a commercial, Off roader with a rather large spec, ARB's and big travel suspension to name a few.
Pajero SWB 2.8 for off road playdays
http://www.youtube.com/watch?v=yYBx3SCl8vs check this for laughs
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| 10th Jan 2010 2:20 am |
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Geraint
Member Since: 15 Aug 2005
Location: Warwickshire
Posts: 18
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They counted the prop rotations for one wheel rotation on the front and rear and they were different. Apparently there is more than one ratio for diffs. I will find out more tomorrow when I go to the dealer
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| 10th Jan 2010 10:40 pm |
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PaulP
Member Since: 04 May 2007
Location: Barcelona
Posts: 4317
 
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Dickydisco wrote:Do the V8 have different to the V6? are auto diff to manual?
No and yes 
I think there are 3 different ratio front diffs for the D3
1. for the petrol ones (V6 / V8 )
2. TDV6 manual
3. TDV6 automatic 2006 Discovery 3 TDV6 SE Auto Buckingham Blue
2007 Golf GT DSG
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| 11th Jan 2010 1:19 am |
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