Omega Owners Forum - strongest GM RWD gearbox(manual)

youngkadettkinin Newbie Offline Posts: 2 Drives: opel kadett and omega	strongest GM RWD gearbox(manual) 16. Feb 2010 at 21:13 i'm new here, just want to know what is the strongest manual gearbox GM make (i.e torque rating). The strongest i know of is the R28, which is rated for 280nm's(hence the 28 in r28). What gearbox does the diesel omegas use? Cheers
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pedroMV6 Omega Knight Offline Der Metzgermeister Posts: 1585 York Gender: Drives: 2.5 Elite, 3.0 Carlton, 2.2DTi Vectra C	Re: strongest GM RWD gearbox(manual) Reply #1 - 16. Feb 2010 at 21:17 Apart from looking Stateside at Corvettes, Camaros and trucks, a Getrag 265 as fitted to some Monzas? Like rocking horse shit to find though!
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tigers_gonads Omega Knight Offline can't spell, don't care !! Posts: 1450 hull Gender: Drives: omega 3.0 v6 cd manual estate	Re: strongest GM RWD gearbox(manual) Reply #2 - 16. Feb 2010 at 21:26 diesel omega's use the r25 box for the manual ar25 for the automatic
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Entwood Omega King Offline Quietly Confident Posts: 13708 North Wiltshire Gender: Drives: 3.2 Elite (with LPG)	Re: strongest GM RWD gearbox(manual) Reply #3 - 16. Feb 2010 at 21:28 tigers_gonads wrote on 16. Feb 2010 at 21:26: diesel omega's use the r25 box for the manual ar25 for the automatic Recomended to fit the AR35 if you chip the diesel. AR35 fitted to the 3.2 V6 petrol auto as standard .. No idea what manual box that has .. but it might be stronger ??
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Welung666 Omega Lord Offline Posts: 9768 West Midlands Gender: Drives: 99 2.5 saloon Tractor	Re: strongest GM RWD gearbox(manual) Reply #4 - 16. Feb 2010 at 21:31 Ex-cops use the R28 aswell even in 3.2 form.
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youngkadettkinin Newbie Offline Posts: 2 Drives: opel kadett and omega	Re: strongest GM RWD gearbox(manual) Reply #5 - 16. Feb 2010 at 21:40 Thanks for all the help, anyone know does the monaro use the same gearbox bolt patern as GM's big block petrol engines(eg z22se, x20xev ect)? I know its a long shot
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2woody

Omega Knight

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Posts: 1402
Northumberland

Drives: '02 MV6, '99 Elite, '99 MV6 estate, '92 Evo 500, Commodore SS

Re: strongest GM RWD gearbox(manual)
Reply #6 - 18. Feb 2010 at 13:13

a couple of things here.......

All Omega A and Omega B manual gearboxes are Getrag 240, made in a GM-specific casing and with either shot-peened gears or not, according to the usage.

A Getrag 240 without shot-peened gears is called "R25"
A Getrag 240 with shot-peened gears is called "R28"

The bell-housing for these is integral with the gearbox casing and comes in three shapes - 4-cylinder petrol & diesel / V6, 6-cylinder diesel and "cam-in-head"

Other than that, there was a Getrag 265 used in some Senator A and Monzas, which uses a separate bellhousing. Beware, though, this bellhousing is "cam-in-head" bolt pattern and won't fit any Omega B engine.

There are three other strong GM boxes :-

ZF 6-speed. Used in Lotus Carlton - fits "cam-in-head" engines

Tremec T56 used in Commodore and Monaro - fits V8 only

Borg-Warner T5. Never used in any V-car

If you're contemplating more power, you don't automatically need a stronger gearbox. There is a natural limit for how much torque you can put through a 'box - and that's when the wheels spin. The "worst-case" for any gearbox is going to be re-starting a car with a heavy trailer on a hill.

hope this helps.

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« Last Edit: 18. Feb 2010 at 13:15 by 2woody »

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2woody Omega Knight Offline Posts: 1402 Northumberland Drives: '02 MV6, '99 Elite, '99 MV6 estate, '92 Evo 500, Commodore SS	Re: strongest GM RWD gearbox(manual) Reply #7 - 19. Feb 2010 at 08:53 thought of another option. You could fit a Ford "Type 9" box, using a specialist "conversion" bellhousing. it's another option, but probably not much stronger than a "240".
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unlucky mark mv6 Omega Baron Offline Posts: 2110 tipton,west mids Drives: 3.2 mv6 and saxo vtr,well the missus does.	Re: strongest GM RWD gearbox(manual) Reply #8 - 19. Feb 2010 at 09:38 2woody wrote on 19. Feb 2010 at 08:53: thought of another option. You could fit a Ford "Type 9" box, using a specialist "conversion" bellhousing. it's another option, but probably not much stronger than a "240". If its a ford part,its probably about as much use as paper mache.
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2woody Omega Knight Offline Posts: 1402 Northumberland Drives: '02 MV6, '99 Elite, '99 MV6 estate, '92 Evo 500, Commodore SS	Re: strongest GM RWD gearbox(manual) Reply #9 - 19. Feb 2010 at 11:35 Aye, they're a bit "chocolate", but able to be rebuilt into something a lot stronger. The Caterham 6-speed version is actually quite a decent box. all completely different to the Getrag units, for which there's nothing available.
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biggriffin Intermediate Member Offline Posts: 302 cambs Drives: big n white.	Re: strongest GM RWD gearbox(manual) Reply #10 - 19. Feb 2010 at 20:11 arnt some of the boxes on beemers compatiable with gm fittings
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