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Author Topic: Sourcing a diff  (Read 2901 times)

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Brewster

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Sourcing a diff
« on: 30 October 2007, 12:39:59 »
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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tunnie

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Re: Sourcing a diff
« Reply #1 on: 30 October 2007, 13:36:42 »
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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Brewster

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Re: Sourcing a diff
« Reply #2 on: 30 October 2007, 13:43:04 »
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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GastronomicKleptomaniac

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Re: Sourcing a diff
« Reply #3 on: 30 October 2007, 15:46:25 »
If the ratios are different, it will throw your speedo out. Just a consideration. :)
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Marks DTM Calib

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Re: Sourcing a diff
« Reply #4 on: 30 October 2007, 16:03:39 »
Quote
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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Paul M

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Re: Sourcing a diff
« Reply #5 on: 31 October 2007, 14:31:23 »
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 :)
« Last Edit: 31 October 2007, 14:35:33 by Paul_M »
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GastronomicKleptomaniac

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Re: Sourcing a diff
« Reply #6 on: 31 October 2007, 15:04:00 »
Quote
Quote
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
« Last Edit: 31 October 2007, 16:46:12 by PeteG »
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Brewster

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Re: Sourcing a diff
« Reply #7 on: 31 October 2007, 16:16:14 »
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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tunnie

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Re: Sourcing a diff
« Reply #8 on: 31 October 2007, 17:22:09 »
Quote
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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Brewster

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Re: Sourcing a diff
« Reply #9 on: 02 November 2007, 19:45:22 »
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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Brewster

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Re: Sourcing a diff
« Reply #10 on: 06 November 2007, 12:42:34 »
Anybody?
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Elite Pete

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Re: Sourcing a diff
« Reply #11 on: 06 November 2007, 13:04:35 »
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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Brewster

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Re: Sourcing a diff
« Reply #12 on: 06 November 2007, 13:09:05 »
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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Kevin Wood

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Re: Sourcing a diff
« Reply #13 on: 06 November 2007, 14:02:25 »
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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ians

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Re: Sourcing a diff
« Reply #14 on: 06 November 2007, 14:14:52 »
I think they are different - also pre/post mini facelift.  The ratios are listed in Haynes.
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