Hi i have a 2003 range rover vogue 4.4 (getting divorced was easier than owning this bugger !! ) i have had a transfer box change ( due to humming/grinding noise when running above 30mph and voilent shuddering every so often) had a new recon gearbox, as well, now after the transfer box change the noise has virtually gone, and the shuddering has gone, at speed but, when turning sharply left or right (from moving off) i get the feeling as if the wheel are stuck/sticking and get suddering goes after the turn ? anyone got ideas or had this happen to them.....also when ever i go over pothole etc i get a large rattle from the passenger side front suspension, but, can find nothing loose or worn (nor can the 4 garages that have tried and failed to find this rattle ?) i will win in the end !!
juiceyv8
New Member
Datatek
Well-Known Member
Datatek
Well-Known Member
Viscous Coupling Unit, it acts as a centre diff lock. If it has seized it will give the symptoms you describe due to transmission wind up. To check it, jack one front wheel off the ground, with a great deal of effort you should be able to slowly turn the wheel. If it will not turn, drop the front prop off until you get the VCU replaced or you will destroy the front diff
Datatek
Well-Known Member
Surprise Surprise, it's on the front of the transfer box. If you replacement transfer box was secondhand it probably came with a duff VCU. If you still have your other transfer box, the one off that may be OK.
Download RAVE and you will see where it is. Not a difficult job to change by all accounts.
Datatek
Well-Known Member
Whoa, first you need to prove it's the VCU, if it is, take the car back to where the transfer box was done and demand they fix it.
I have just noticed, you are talking about an L322, not sure if thay are the same as a P38, I might be talking rubbish!
jamesmartin
Well-Known Member
i dont think l322 use vc ithink they are all electronic must have front cv or diff centre fault, they are prone to anti roll bar links and lower arm ball joints
Datatek
Well-Known Member
Just looked up some stuff, I think the L322 uses a Torsen centre diff which is limited slip by design so no VCU:doh:
