ok i have  a whinning rubbing sound from the rear of my car i read a few post of what it could be but if i went down the scrap yard and got one of any omega would it fit mine a straight swap
any advise much aperciated

You will really need one from another auto as the diff raito is differant between auto and manual cars the wrong one will send your spedo out .

bigtow wrote on 03. Jun 2009 at 08:30:

You will really need one from another auto as the diff raito is differant between auto and manual cars the wrong one will send your spedo out .

Won't send the speedo out as the speedo feed is from the ABS sensors that read the ABS toothed rings externally to the diff.

As you say, will be a different ratio though.

I have a diff from a 2.5 Auto you can have with pleasure. 50k miles (ish) and quiet.
What year is your car? I will check to see the ratios are the same.
Where in the Midlands are you?

im in cannock in the midlands mines a 3.0 would that mater but i would be interested pm me

the same thing happened to my dif,, the haynes maual gives the ratios for different engines,
you may be better buying the dif complete with the drive shafts as mine were stuck inside the dif,
paul

so theres a good chance the noise is the diff then as if not im changing the box after so a second hand diff with shafts is what im after any body have the ratios for a 3.0

For a 3.0 with AR35 autobox you want a 3.9:1 diff.
The one I have is off a 2.5 and is 4.22:1. It would increase your fuel consumption slightly on a run but might not make much difference around town. Accelleration would be good though.  ;)

Driveshafts are retained by snap rings into the diff, you use a pair of large screwdrivers or prybars between diff case and shaft, take up the slack then jerk the prybar and the shaft pops out.

so wouldnt it need to be stronger like the ar35 boxes are if not how much you looking for the diff

gazsomega wrote on 03. Jun 2009 at 07:31:

ok i have  a whinning rubbing sound from the rear of my car i read a few post of what it could be but if i went down the scrap yard and got one of any omega would it fit mine a straight swap any advise much aperciated

All the best if you can find one in a scrapyard mate. :y

the drive shafts are very easy to take out but as i said mine was stuck solid, i was going to strip down the dif to see what had jammed it ,its stands to reason that its the same reason the dif was whinning.
i bought a 2nd hand dif but the bloke had grind the shafts in half and left the CVs in, i thought i would be able to just put then on the end of my origanal shafts but you have to to basiclly destory the CVs to get them opened up.
checking the haynes book these are the ratios
upto 1998
all 2.0L--------3.90:1
2.5L  manual--3.70:1
          auto----3.90:1
3.0L manual---3.70:1
          auto----3.70:1
from 1998
all 2.0L--------3.90:1
2.5L manual---3.90:1
            auto---4.22:1
3.0L manual---3.70:1
             auto--3.90:1
hope this helps

yeah thanks lads this has been great help