turbo proof gearbox bmw s14,s38,m30,m88 - Page 2 - BMW M5 Forum and M6 Forums
E34 M5 Discussion 1988-1995 Sedan and Touring

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post #11 of 13 Old 12th April 2019, 09:40 AM
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This is awesome information. I did not know anyone produce this adapter.

Do you understand the "special separate clutchshaft"? Is it longer than the original to account for the spacer width?

Seems like the same input shaft (diameter and teeth) as original S38/M5...
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post #12 of 13 Old 12th April 2019, 11:29 AM Thread Starter
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gearbox adapter


I think that the gearbox must be taken open.
and that the outpout shaft must be changed for a longer one.

I have sended a email because I want more info.
the problem was that like the big heavy 6 speed boxes like the e39 m5 and the s6 53 diesel and petrol boxes.
you can not get parts because they are not ment to be taken open.
when you try this they break.I have never found a company that can taken a gearbox like that open and back closed again without get it damaged.

I think that this is the reason the use the zf s5 310:320 because it go's easy open.
I do not know the 6 speed e36 m3 is going as easy open because its the same like the e39m5 box.
only the output shaft is smaller.the e39 m5 and the e46 m3(v8) box have the same thicker output shaft.
the bellhousing shape is different to but the gear inside are all the same.

when I know more I will post this here.
but when you see the prices of the getrag 280.
and with this adpater you can go to the zf s5d 320(the later are stronger)
then you have a good and strong box,and its cheap to find.


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post #13 of 13 Old 13th May 2019, 05:27 AM
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Originally Posted by bmwmtechnike24 View Post

A quick update

a friend of me Tim Maatman(you can find him on facebook he makes a lot of turbo cars)
he helped met out with his solution to make a bullet proof
turbo gearbox,with rebuilding a 6 speed diesel and petrol gearbox.

I will use the petrol version for the s38 and the diesel version for the m106.

but no I found this online.
I think this will help a lot of people there for I post it here.

Växellåds Adaptrar : ZF Adapter Plate ZF to M10/M30/S14/S38


This was discussed here: https://www.m5board.com/#/topics/597540
Shaft change is no longer required. Instead, a custom billet flywheel is used.

On the other hand, my family friend, who sadly died in a high speed crash, had experimented with this combo, years back. Other than making an adapter plate, he also made custom clutch plate. It is said that he achieved this by combining the original plate used on a M30 flywheel, with a clutch plate from a ZF "compatible" flywheel. Mind you, I haven't seen this concoction, but I was told that it worked quite well. The "ZF" centre piece would somehow, magically be swapped into an M30 original plate, making it suitable for both sides. If I hadn't found an original G280 recently, I would have tried this myself. Perhaps if I decide I want the 6th gear, in the future... 😁
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