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Getrag Transmission Numbers.... Again

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Getrag Transmission Numbers.... Again

Post by G03rt2 » Sun Dec 16, 2018 10:25 pm

I started looking into this because I'll be upgrading my clutch soon, along with parts needed to firm up the shifting. The reason I don't really know what transmission I have is because I have a 1981, but it has a M30B35 from a later model. I started to wonder if the motor and transmission was swapped, or just the motor.

The numbers on the transmission are:

It's a 3-piece case, but definitely not a dog-leg. Is it possible to have a close ratio with overdrive?

This is more for my curiosity at this point then anything else. Any help is appreciated.

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Re: Getrag Transmission Numbers.... Again

Post by baders » Mon Dec 17, 2018 12:00 am

Getrag casing numbers are problematic for identification. It sounds like an overdrive 265, not CR. CR is normally associated with the dogleg with 1:1 final ratio. Do you have any photos ?
1986 635csi LOCUTUS / Arktis Blau Metallic / Pearl Beige / S38B36/ Close ratio dogleg 5sp
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Re: Getrag Transmission Numbers.... Again

Post by G03rt2 » Mon Dec 17, 2018 2:09 am

I do have pictures. What were you thinking? I mean, what should I take a picture of to identify it better? I don't doubt that it's just a standard 5-speed transmission, but post after post on BMW forums has me confused now.

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Re: Getrag Transmission Numbers.... Again

Post by bpoliakoff » Mon Dec 17, 2018 2:18 am

Not a close ratio if it has an overdrive 5th. If regular shift pattern that is it for sure. Just because it is an 81 doesn't mean it is a close ratio which was was an option so it could have come with the O.D. box original and have the mechanical speedo drive provision
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Re: Getrag Transmission Numbers.... Again

Post by Brucey » Mon Dec 17, 2018 10:16 am

in 1981 the default manual transmission on a 635CSi would have been an overdrive 5s gearbox (Getrag 265/6, with detachable bellhousing) paired with a 3,07 diff. This has a standard (i.e. fifth gear offset) shift pattern, and the net gearing means that if you could pull the (overdrive) top gear, the car would do about 200mph . The alternate optional (sports) gearbox would have been a close ratio Getrag 265/5 gearbox which looks the same apart from the tail housing, and has an offset first gear (i.e. dogleg shift pattern). Again a 3,07 diff would have been standard, meaning that the top gear ratio with a CR gearbox would be the same as 4th in the OD gearbox.

The 265/5 (CR) gearbox is often called a 262 (CR), but both 265/5 and 265/6 have a main housing that says 262 on it, which is a carry-over from the 262 four-speed model. If you have a 265/5 CR gearbox sat side by side with a 265/6 (OD) gearbox they are only different in the tail housing. Otherwise they are identical in appearance.

All this explained in detail (with pictures and links) here



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Re: Getrag Transmission Numbers.... Again

Post by Mamod17 » Sun Jan 19, 2020 11:05 am

Great info, thanks Brucey. I'm interested if anyone has an opinion how the 265/6 feels compared to the 260. I've heard the 265 is referred to as a more desirable box. Does it feel sportier? Different linkage feel? Tighter? I believe the 265/5 CR is referred to as the sports box, was the 265/ever referred to as a sports box? thx...
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