There are two options for the transmission. One is the e36 318 or 325 transmission, which can be connected directly to the original e30 5-speed driveshaft.
Alternatively, there is the e36 M3 transmission; it's beefier, but adds a weight penalty. In addition, it is necessary to acquire either an e30 M3 5-speed driveshaft or a '97 e36 M3 5-speed driveshaft.
Dette stemmer ikke helt med det du skreiv litt lengre opp her fliid, har du erfaringer med at orginal mellomaksling IKKE passer på 325 kasse?