Need help with a transmission.

[Porthos]

I was given this http://www.realoem.com/bmw/enUS/show...diagId=23_1140
I have a 1990 318i Touring with the M40B18. I know that the m10 and the M40 transmissions are not interchangeable but, I was wondering if someone could help me out and tell me if I need to just go ahead and part with the transmission I was given or to see if it will fit.
This is what is on the car now

http://www.realoem.com/bmw/enUS/showparts?id=AG72-EUR-06-1990-E30-BMW-318i&diagId=23_0290

[nando]

http://www.realoem.com/bmw/enUS/partxref?q=23001221208&series=E30

looks like it might fit. the confusing part is it shows the G260 as fitting the M10, but I didn't think that was true. maybe there's another bellhousing I've never seen before.

I think the G260 is longer though so you would need a different driveshaft.

[Porthos]

That's what is weird that the M10 and M40/M42 transmission were not interchangeable. Hmm so confused right now.

[TobyB]

The M30 and M10 transmissions have the same bellhousing
(M30 = M10 +2)
The M30 did get a version of the G260- removable bellhousing? I forget...

but it is different than the M40/42/5x pattern.

t

[Porthos]

The M30 and M10 transmissions have the same bellhousing
(M30 = M10 +2)
The M30 did get a version of the G260- removable bellhousing? I forget...

but it is different than the M40/42/5x pattern.

t

Cool man thanks for the help. I guess I am going to part with it.