Omega Owners Forum

Omega Help Area => Omega General Help => Topic started by: johnnydog on 07 October 2012, 23:01:05

Title: Differences in auto gearbox
Post by: johnnydog on 07 October 2012, 23:01:05

I have been unable to find any particular reference to this in previous posts -  is there any actual difference between auto gearboxes, say with 2.6 and 3.2?
Parts listings show a variety of auto gear boxes part numbers for the Omegas, identified only by ident numbers, not engine size.
I wondered if anyone had information on this - are the 2.6 and 3.2 the same gearbox; any difference being in the torque converter with the final ratios transmitted to the rear wheels being determined by the diff, or are the gearbox ratios different?
In short, can a gearbox from a 2.6 be fitted in a 3.2, or am I looking at further problems? Reprogramming the gearbox ECU for example? 
Or would it be wise to find and fit a gearbox with the same ident number?
Anyone with experience of this or the technical info that could shed any light would be greatly appreciated.
John

Title: Re: Differences in auto gearbox
Post by: albitz on 07 October 2012, 23:05:28

3.2 (and earlier 3.0) use AR35 unit.All others use the less strong AR25 unit.If your changing the box on a car fitted with an AR25 you can use an AR35 (its a straight swop on petrol models),in fact its advisable to do so while the opportunity is there to do so.
No point fitting an AR25 from a 2.6 into a 3.2.It would fit ok but wouldnt last very long.The torque of the 3.2 would chew it up. :y

Title: Re: Differences in auto gearbox
Post by: RobG on 07 October 2012, 23:07:57

And the manuals up to 2.6 ltr take the R25, 3.0 & 3.2`s take the R28

Title: Re: Differences in auto gearbox
Post by: johnnydog on 07 October 2012, 23:54:01

Well that's cleared that point up as to whether a 2.6 and 3.2 are interchangeable, many thanks - just one thing,  Albitz refers to an AR35 and RobG it an R28 - I'm slightly confused.... 

Title: Re: Differences in auto gearbox
Post by: RobG on 07 October 2012, 23:55:21

Quote from: johnnydog on 07 October 2012, 23:54:01

Well that's cleared that point up as to whether a 2.6 and 3.2 are interchangeable, many thanks - just one thing,  Albitz refers to an AR35 and RobG it an R28 - I'm slightly confused....

AR = Auto
R = Manual

Title: Re: Differences in auto gearbox
Post by: johnnydog on 08 October 2012, 00:39:16

Got that now - if I had read the replies properly, it would help!!
Thanks again.

Title: Re: Differences in auto gearbox
Post by: Andy89 on 08 October 2012, 16:02:53

Quote from: RobG on 07 October 2012, 23:07:57

And the manuals up to 2.6 ltr take the R25, 3.0 & 3.2`s take the R28

Only 3.0 uses R28, 3.2 uses R30  ;)

Title: Re: Differences in auto gearbox
Post by: johnnydog on 13 October 2012, 00:02:17

So it would be OK to fit a autobox from a 1999 facelift 3.0 into a 2003 3.2? I presume that from the info given that they both have AR35 boxes?
Thanks

Title: Re: Differences in auto gearbox
Post by: TheBoy on 13 October 2012, 08:51:10

Quote from: johnnydog on 13 October 2012, 00:02:17

So it would be OK to fit a autobox from a 1999 facelift 3.0 into a 2003 3.2? I presume that from the info given that they both have AR35 boxes?
Thanks

Yes. Both have the AR35 (35 = rated to 350Nm).

Title: Re: Differences in auto gearbox
Post by: johnnydog on 14 October 2012, 01:14:24

Many thanks for all the info....I just need to find a good auto gearbox now!