Transverse 4WD Gearbox
Discussion
I am looking for transverse 4wd gearbox with the output shaft to the rear diff (in a front engined application) on the opposite side to the main driveshafts.
This is for use in a mid4 vehicle and I realise there are complications in using the gearbox the wrong way around, but I cannot find any transverse mid-engined 4wd car to use the gearbox out of other than the Peugeot 205 T16, and somehow I doubt thats really an option.
Anyway, this is the layout I'm looking for:
(or similar)
The only other possibility may be to convert a standard front engine 4wd gearbox, but I cannot think how or how easily this would be done...
This is for use in a mid4 vehicle and I realise there are complications in using the gearbox the wrong way around, but I cannot find any transverse mid-engined 4wd car to use the gearbox out of other than the Peugeot 205 T16, and somehow I doubt thats really an option.
Anyway, this is the layout I'm looking for:
(or similar)
The only other possibility may be to convert a standard front engine 4wd gearbox, but I cannot think how or how easily this would be done...
Hi everyone thanks for the replies,
Unfortunately as I am building this car as a special stage rally car, 2 engines is not within the regulations.
I must say that Zad has gone some way to clearing up the reason why you don't see any transverse gearboxes with the prop on the otherside of the engine. From the cross section of the rs2000 gearbox, you can clearly see it is just the standard 2wd gearbox with a transfer box bolted onto it. As I would imagine most car manufacturers do it like this (so much easier than designing a proper 4wd gearbox), no wonder there aren't many like I'm looking for.
As such, I may have to consider the option of using a conventional gearbox upside down, or forking out for a Sadev SL90-20
I'd rather not consider the cost of the sadev (although I must admit I haven't looked at the price of one so i'm only assuming it's bloody expensive) so what are the options with a standard 4wd gearbox. Is it possible to run the gearbox out of say... a subaru impreza upside down?
beejay said:
Hmmm, been through this recently haven't we 
indeed we have but i'm pretty sure no real anwser was suggested in the end...Unfortunately as I am building this car as a special stage rally car, 2 engines is not within the regulations.
I must say that Zad has gone some way to clearing up the reason why you don't see any transverse gearboxes with the prop on the otherside of the engine. From the cross section of the rs2000 gearbox, you can clearly see it is just the standard 2wd gearbox with a transfer box bolted onto it. As I would imagine most car manufacturers do it like this (so much easier than designing a proper 4wd gearbox), no wonder there aren't many like I'm looking for.
As such, I may have to consider the option of using a conventional gearbox upside down, or forking out for a Sadev SL90-20
I'd rather not consider the cost of the sadev (although I must admit I haven't looked at the price of one so i'm only assuming it's bloody expensive) so what are the options with a standard 4wd gearbox. Is it possible to run the gearbox out of say... a subaru impreza upside down?
beejay said:
Not sure how an impreza upside down will help? Engine is head of the front axle, front diff/axle is just behind the clutch and it presents a rear prop coupling on the rear of the casing (AFAIK anyway!), can't see how you could work that into a mid engine 4WD setup?
If you're looking at longitudinal mid engined, then possibly sierra 4x4 or landrover might work, if you could attach the rear diff directly to the rear of the gearbox. Still puts the rear axle line a long way back from the engine so unlikely you'll have room to package that in?
I'd assumed the subaru gearbox was similar to the sierra 4x4 arrangemant, so sorry if that was confusing. The sierra 4x4 arrangement sounds like it might work but like you say packaging might be an issue. There is quite a sizable propshaft tunnel in the mk2 mr2, if you can call it that considering there is no propshaft....If you're looking at longitudinal mid engined, then possibly sierra 4x4 or landrover might work, if you could attach the rear diff directly to the rear of the gearbox. Still puts the rear axle line a long way back from the engine so unlikely you'll have room to package that in?
I just have to work out how much
and 
will be required to fit it all in.chuntington101 said:
Also what engine are you planing on running?? Have you thought about using a gutted FWD box????? you would need some very low geard diffs (prob 1:1) though. i have seen this done on scrapheap but never in real life.....
The plan is to use a nissan VQ35 but destroked to 2.5L and fitted with a turbocharger (thats the plan anyway).I was hoping to use a fwd gearbox but unfortunately a standard gearbox in a 4wd application in the back of an mr2 would put the engine behind the axles. not so good for weight distribution....
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