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[Zippy2012]

What spec omega runs a 3.45 diff please.... 

Also will saloon diff/drive shafts fit an estate??

Can someone ask 2woody please...

[RobG]

What spec omega runs a 3.45 diff please.... 

Also will saloon diff/drive shafts fit an estate??

Can someone ask 2woody please...

Think it`s the 2.2 diesel
All V6 d/shafts are the same, all 4-pots the same, not interchangeable unless you use the hub as well

[Zippy2012]

What spec omega runs a 3.45 diff please.... 

Also will saloon diff/drive shafts fit an estate??

Can someone ask 2woody please...

Think it`s the 2.2 diesel
All V6 d/shafts are the same, all 4-pots the same, not interchangeable unless you use the hub as well

So if the diff is from a 2.2dti 4pot will i need to swop the whole lot? or is the diff unit end of driveshafts the same??
a mate is breaking a 2.5 manual & an auto, guess diffs are different ratios...
ive been told all the V6s run a 3.70 inc the autos
but there are 4 diff ratios can any one confurm the diff ratios for each model?? & if auto/manual & engine types??
3.45
3.70
3.90
4.22
Thanks all

[twiglet]

http://www.omegaowners.com/forum/index.php?topic=90453.0

[Zippy2012]

http://www.omegaowners.com/forum/index.php?topic=90453.0

Cheers Twig i looked but didnt find that... umm ok 2.2 has a 3.45   

but has anyone done a pre/m facelift sheet??

need 2 find out the 2.5td ratios... coz thats all i can find & v6 ones....

[RobG]

What spec omega runs a 3.45 diff please.... 

Also will saloon diff/drive shafts fit an estate??

Can someone ask 2woody please...

Think it`s the 2.2 diesel
All V6 d/shafts are the same, all 4-pots the same, not interchangeable unless you use the hub as well

So if the diff is from a 2.2dti 4pot will i need to swop the whole lot? or is the diff unit end of driveshafts the same??
a mate is breaking a 2.5 manual & an auto, guess diffs are different ratios...
ive been told all the V6s run a 3.70 inc the autos
but there are 4 diff ratios can any one confurm the diff ratios for each model?? & if auto/manual & engine types??
3.45
3.70
3.90
4.22
Thanks all

Difference is the bolt pattern at the hub.
You`ve been told wrong then.

[Zippy2012]

What spec omega runs a 3.45 diff please.... 

Also will saloon diff/drive shafts fit an estate??

Can someone ask 2woody please...

Think it`s the 2.2 diesel
All V6 d/shafts are the same, all 4-pots the same, not interchangeable unless you use the hub as well

So if the diff is from a 2.2dti 4pot will i need to swop the whole lot? or is the diff unit end of driveshafts the same??
a mate is breaking a 2.5 manual & an auto, guess diffs are different ratios...
ive been told all the V6s run a 3.70 inc the autos
but there are 4 diff ratios can any one confurm the diff ratios for each model?? & if auto/manual & engine types??
3.45
3.70
3.90
4.22
Thanks all

Difference is the bolt pattern at the hub.
You`ve been told wrong then.

so the 2.2dti diff will fit my driveshafts.. just wanted to check before i try find one..

GmasterT has pre facelift 2x 2.5tds diffs 1 from a manual 1 from an auto for sale but i calnt find out what ratio they are..
but also 1 a saloon 1 an estate but just need to work out ratios.. (as he calnt rem how to work it out)

looking on ebay there are a load of 2.5/3.0v6 diffs all 3.70 ratios
The spec sheet for mine is 3.90 & on motorway revs high at 3100rpm @70mph 3500rpm @80mph 3900rpm @90mph
so on a run of 100 miles im only returning 22-24mpg but @50mph @2400rpm i get 33-36mpg over 100miles
so by changing the diff to a 3.45 should drop my 70mph from 3100 to neer 2500rpm giving me better mpg..

[RobG]

Better off asking admin to move this to "General Help". Any more Q`s regarding Omega`s that`s where you should be posting

[Zippy2012]

Can admin please move this to best area to get a better viewing please guys 

& hopefully 2woody will notice it 

[Zippy2012]

Cheers Hotel21 for moving this for me! 

[Zippy2012]

Does ANYBODY know??? thanks twigg for the facelift specs but need to find out pre facelift specs too???

[GmasterT]

Well the one out of my 2.5 manual is 3 and 1/4 turns on the prop to one wheel rev. Dunno how that translates? And on that I'm off to bed!

[2woody]

apologies - I haven't been around a lot lately.

I also haven't had a chance to look at my diff stock to see what I've got - I've a hunch it's no 3.45's tho.

there are two distinct ways to measure what you've got......

if fitted, measure the engine revs you've got at, say 60 in 4th gear (manual) or 3rd gear (auto) with a sat-nav, then convert into mph per 1000 revs. Use this formula....

60000 divided by ( wheel revs per mile times diff ratio ) = mph per 1000 revs.

if the diff's not fitted, take the rear cover off, rotate the gubbins enough and you'll come across the number of teeth stamped on the crownwheel. 10:37 is 3.7 for instance.

[Zippy2012]

ive been trying to souce one off ebay but all they say is "good diff out of a 2.5v6/3.0v6/2.5td/2.2petrol" etc etc & they all say that they are not prepaired to strip the units to find out...

so trying to find out what diffs are fitted into what engine specs/gearboxes

i already know my car is a explod 3.0v6 estate with a 2.5td wideratio gearbox & 3.90.1 LSD from factory spec sheet but
@70mph pulling 3000rpm in 5th
@80mph pulling 3400rpm in 5th
@90mph pulling 3800rpm in 5th
roughly 400rpm per 10mph
tomorrow im back up to bham so will find out @60mph in 4th the rpms, to see what gear-diff combo it says..??
as you say it should work out to be a 3.90.1 but i wonder with the W/R gearbox if it gives us a diff ratio??
basicly what im trying to acheive is to lower the rpms @70mph to around 2200/2400rpms because if u cruse at 50mph i get 36mpg but @ 70ish 27mpg  @ 80ish 24mpg 
i use the car mostly for long distance motorway work use, ive a pug 106 1.5d for local journeys..
oh will a saloon diff fit an estate??
There was a guy on here (fogot user name )who got my spec sheet from my reg who works at a vauxhall dealer i wonder if i can ask people for reg numbers from each spec vehical if he could tell me the ratios??

[2woody]

MUST use 4th

MUST use sat-nav for the speeds ( or other GPS device )

and also please post your tyre make and size.

ta.