Omega Owners Forum
Omega Help Area => Omega General Help => Topic started by: Brewster on 30 October 2007, 12:39:59
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As I have mentioned before, the diff on my 3.0 MV6 is whining a little. Whilst it hasn't got any worse in the past 5k miles and still runs fine I think it'd be prudent to get hold of another, just in case. Can anyone tell me if the diff on this car is the same as the 2.5? If they are the same fitment but different ratios I can live with that as I don't do silly speeds in 3.0 anyway.
Thanks
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the diff would be the same for 2.5/3.0 i think.
You may have a limited slip diff on your mv6 but this is unlikey.
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I'm pretty sure it isn't an LSD on there currently. I'm not even sure it needs replacing, it's just noisey, but after my crank sensor debacle I'd rather be safe than sorry and have one ready just in case. :)
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If the ratios are different, it will throw your speedo out. Just a consideration. :)
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If the ratios are different, it will throw your speedo out. Just a consideration. :)
It wont, the speedo signal is derived from the ABS sensors which are post diff.
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The 2.5 diff has a higher ratio, giving lower gearing overall. Which is a good thing IMO, unless you spend 90% of your time cruising on the motorway. The difference is pretty small anyway, the actual figures are listed at autobahnstormers.org
3.0 MV6: Manual 240 mm 3.81:1 2.11:1 1.34:1 1.00:1 0.81:1 3.40:1 3.70:1
2.5 CDX: Manual 228 mm 3.95:1 2.19:1 1.39:1 1.00:1 0.85:1 3.53:1 3.90:1
First figure is the clutch diameter, then the gear ratios from 1st to 5th, then the reverse gear ratio, and finally the diff ratio. So the 2.5 diff gives 5% lower gearing than the 3.0 diff :)
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If the ratios are different, it will throw your speedo out. Just a consideration. :)
It wont, the speedo signal is derived from the ABS sensors which are post diff.
:D D'oh. Bloody new fangled things, I'm used to bloody old F**ds... *another bit to note* :y
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Well, as long as they both fit it gives me more options. Now it's just a case of finding one. Many thanks.
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Well, as long as they both fit it gives me more options. Now it's just a case of finding one. Many thanks.
Quite a few members are breaking cars currently... so its worth posting up :y
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Can anyone tell me whether there is a difference between the diffs used on manual and automatic V6s? I'm hoping they are the same as they are in the final drive....
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Anybody?
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Is there oil on the diff casing? It could be your diff needs a top up or better still replace the oil.
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Yeah, there's plenty of oil in the diff. It is a bit black, but a change won't cure the whine I don't think. I'm just wondering if the diff on an automatic is the same as on a manual. :)
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I would be very surprised if they're physically different but they may well be different ratios between auto and manual.
Kevin
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I think they are different - also pre/post mini facelift. The ratios are listed in Haynes.
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3.0 Auto and 2.5 Auto/Manual are the same ratio, 3.0 Manual is different....
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I fitted an lsd to my explod mv6 and also to the 2.0 batomegabile and while they are different they will fit.
The flange at the front of the diff is bigger on the 3.0 than the 2.0 but can be swapped over.(taking care with
retightening the nut to the same position as it was taken off). Not sure about the 2.5 but the same applies.
the mounting bracket is also different but again will fit. Try to make sure you get the mount with the diff.
The drive shafts are the same fitting into the diff throughout (although different in other ways).
Hope this helps.
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Cheers for the help. It looks like it might be easier trying to get hold of a 3.0 manual diff as a straight swap then.
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Cheers for the help. It looks like it might be easier trying to get hold of a 3.0 manual diff as a straight swap then.
Its the only easy way due to the difference in ratios of the 2.5 (V6's use the same flange)