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[Lesopc]

Does anyone know if it is a lot of work to upgrade to a 6 speed gearbox in a facelift miggy?
I was looking at Getrag's website and was thinking of one of their applications to in the future be mated to a LS series V8.
Also are there any factors to be aware of before taking on such a job?
If anyone has any recommendations such as other gearboxes or things like new diff etc. then feel free to contribute.

[Mr Skrunts]

Same thing different idea.

There used to be a V8 conversion company at silverstone I think it was.  They offered a cervive to drop a rover V8 into most cars, beetles, land rovers and may the datsun z car,

They made engine to bellhousing, or/and bellhoung to gearbox adapter palted to suit the clutch beitng used  or if other ukits were used they made a plate to aloow all mounting surfaces and holes to be lined up.

If you are going the LS7 direction and there is a suitable box and the supplier can give to the answers you require then contact some of the US parts importers who build/rebuild cars etc and have machine equipment and facilittes like B&H Autohradt in Doncaster who build all forms of dragsters from scratch and were at least parts imports both new and S/H and supply crate engines.

[Marks DTM Calib]

Lol, if going LS route then a Monaro T56 gearbox will bolt straight on.

Or, it might be possible to use an auto box bell housing (to match the engine fittings) and then an adaptor plate to mate to the chosen box (which is a good way of mating Rover V8's up as auto bellhousings are about 1 inch shorter)

[2woody]

there is no 6-speed compatible with the Omega 54-degre V6 without making stuff to suit. forget adaptor plates, etc. they're a real bodge.

but when you go to LS-power, the easiest is to use the T56 that'll come with the engine.

actually, there might be a way, but it'll be really expensive and not strong enough for a car of the Omega's weight - you'd use the Caterham bellhousing for adapting a 2.0 XE engine to Caterham's own 6-speed box. BUT the box is a modified Sierra type-9 box and probably not up to the job. expect bellhoisung + box to be more than the cost of a LS1 + T56

[Kevin Wood]

there is no 6-speed compatible with the Omega 54-degre V6 without making stuff to suit. forget adaptor plates, etc. they're a real bodge.

but when you go to LS-power, the easiest is to use the T56 that'll come with the engine.

actually, there might be a way, but it'll be really expensive and not strong enough for a car of the Omega's weight - you'd use the Caterham bellhousing for adapting a 2.0 XE engine to Caterham's own 6-speed box. BUT the box is a modified Sierra type-9 box and probably not up to the job. expect bellhoisung + box to be more than the cost of a LS1 + T56

ISTR the Caterham 6 speed has daft ratios, designed to keep a 1.4 K series on the boil, as well.

6th gear is 1:1 and 1st is quite high, certainly <3:1. So you'd need a diff from a diesel to get decent RPM at cruise and a bootload of spare clutches for pulling away. In-between those 2 extremes your left hand will be a blur.

Which brings me to the point I was going to make:

Why do you (think you) need a 6 speed gearbox?

The GM V6 in standard form has a wide power band. There's good torque from 2K RPM. It's certainly pulling well by 2.5, all the way up to 6K+.

With a 5 speed box after changing up from each gear you will be landing back at an RPM where the engine is well and truly "on the boil" so why do you need another gearchange? It will probably just slow you down.

If it were a highly tuned engine or a diesel it might be a different story...

Kevin

[Lesopc]

Just to make fine my point.

1. My current engine is a 2.0 16v straight 4 and NOT a V6. This is not what i expect to mate to a 6 speed however.

2. What i do intend to do is mate a LS series engine of V8 type to a 6 speed box and was looking for help/inspiration to make my race replica as authentic as possible WITHOUT going down the GRP body sillouhette route.

I feel a 6 speed is necessary to keep this project car in line with some of the current power saloons out there from the likes of BMW, Audi, Mercedes-Benz etc.

Any more ideas are welcome.

[Marks DTM Calib]

Just to make fine my point.

1. My current engine is a 2.0 16v straight 4 and NOT a V6. This is not what i expect to mate to a 6 speed however.

2. What i do intend to do is mate a LS series engine of V8 type to a 6 speed box and was looking for help/inspiration to make my race replica as authentic as possible WITHOUT going down the GRP body sillouhette route.

I feel a 6 speed is necessary to keep this project car in line with some of the current power saloons out there from the likes of BMW, Audi, Mercedes-Benz etc.

Any more ideas are welcome.

Well your answer is above....the T56 from a Monaro.

[2woody]

the 6-speed is the standard gearbox for the LS-1 powered cars.

having said that, the engine's torque spread is so great that you'll not use all six.

I've had only 3rd and 5th in my Holden for some considerable time - and it still outpaces pretty much anything else on the road

[Kevin Wood]

I've had only 3rd and 5th in my Holden for some considerable time - and it still outpaces pretty much anything else on the road

I'll testify to that.

Kevin

[Lesopc]

Most of you seem to like the LS series mated to a T56 Tremec box.

If i were to fit a T56, would i need to adjust the centre console inside the car for the gearlever or would it be an almost complete match for the current 5 speed manual box?

[Liam]

If you position the engine/box appropriately it'll match up. If not, it wont! Will be essentially up to you. Omega bulkhead/front legs may have something to say on the subject too.