What gearbox for 46kg of torque?

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   Dear all,
I am new on this forum, so happy new year to all!
I would like to fit a manual transmission to a Mercedes M117 5,6 litres V8 engine that develops 300 hp at 5000 rpm and 46 kg of torque at 3750 rpm (a 286 hp M5 has 34 kg of torque and a 745 39 kg). my rear end ratio is 3,07 and my tires are 215/65/15.
It sems that Getrag gearboxes, fitted on BMWs, are the only ones rather easily available that could bear that torque, but I don't know for sure. I would rather go for a 0.81 overdrive 5th, but I don't know if I should for a 265/5 or 6? or a 280? I'm a bit lost in all these models, their gear ratios and the torque they are able to handle... So any help would be graetly appreciated!
Gael

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Gael Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 12-January-2006 Status: Offline Points: 2	Topic: What gearbox for 46kg of torque? Posted: 12-January-2006 at 13:01
	Dear all, I am new on this forum, so happy new year to all! I would like to fit a manual transmission to a Mercedes M117 5,6 litres V8 engine that develops 300 hp at 5000 rpm and 46 kg of torque at 3750 rpm (a 286 hp M5 has 34 kg of torque and a 745 39 kg). my rear end ratio is 3,07 and my tires are 215/65/15. It sems that Getrag gearboxes, fitted on BMWs, are the only ones rather easily available that could bear that torque, but I don't know for sure. I would rather go for a 0.81 overdrive 5th, but I don't know if I should for a 265/5 or 6? or a 280? I'm a bit lost in all these models, their gear ratios and the torque they are able to handle... So any help would be graetly appreciated! Gael

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Brucey Members Profile Send Private Message Find Members Posts Add to Buddy List Really Senior Member II Joined: 07-March-2004 Location: United Kingdom Status: Offline Points: 744	Posted: 12-January-2006 at 13:11
	kg is a unit of weight kgm is a unit of torque you rightly suppose that torque is the thing to worry about as this is what trashes gearboxes. There is a borg-warner box that sits behind cosworth engines and the like. This will handle the torque OK. What do you plan to use for a bell-housing?
	~~~~~~~ Brucey ~~~~~~

Gael Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 12-January-2006 Status: Offline Points: 2	Posted: 12-January-2006 at 13:25
	Are you thinking of the Tremec T5 (formerly Borg Warner if I'm not wrong)? For the bell housing, I don't know yet. If the Getrag can hold the torque, I may consider using BMW parts for flywheel, clutch plate and mechanism and bell, with an adaptator plate. For now I need to know if any of the Getrag mounted on BMWs can hold 46 Kg/m of torque...

Sohlman Members Profile Send Private Message Find Members Posts Visit Members Homepage Add to Buddy List Really Senior Member II Coupe Chairman Joined: 19-August-2003 Location: Surrey Status: Offline Points: 1259	Posted: 13-January-2006 at 03:43
	The E39 M5 box is about as strong as you can get that along with the 280 box.
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