What kind of gearbox to use on high power F6 ? Options

[speedsterms]

Hi all,
I leave in France.
I use to have some 911 (3.2l, 993RS Club Sport, 993 RSR, 993 c2)
today I am on another project : 917K Replica.
with a mid mounted engine - the reason why i am asking my question here-

My engine will be a high rev/high power aircooled 3.6l.

I have planned to mate the engine to a 915 gearbox with flipped R/P. but I was told by my mechanic that the 915 will not handle the torque. even if I improve oiling and cooling and add a wevo bearing retainer.

I had a G50 (which I swap to the 915) as it was not usable. impossible to flip R/P. and flipping the gearbox is not acceptable to the CV joint (too much angle) .

I wonder if any one of you have tryed to install a cayman 987.2 gearbox (G8740 to be precise, not the fisrt gen) on an aircooled flat6 ?

Is there any kit available ? (adapter plate)

[mepstein]

We put aluminum 915 boxes behind built 3.6/3.8 engines all the time. Is it as strong as a G50, no. Will it work great, yes.
Here’s a Peter Dawe (look him up) built 3.8 with a good 350hp in a 81 SC. Customer has been driving it for 3 years and is in the shop for MCS coil over shocks and big brakes. The engine pulls like a freight train. I have a good 100 miles in it, test driving to make sure it’s all sorted.

I do have a Peter Dawe built Carrera trans with a factory cooler, if you are looking for a trans for your 917. Also an SC trans with lsd. I can also build with custom gears if you are looking for something special.

*Dawes Motorsports doesn’t have a vapor blast machine so the case isn’t “pretty”.

[stownsen914]

A 915 can be built to handle it as mentioned.

Boxster 6 speeds have been put behind mid mounted aircooled 911s, but it doesn't bolt up (different bolt pattern), and there's no kit that I've heard of.