difference between gs6-37bz/dz transmission from e46 and early e90

[Slovik]

After 8 years and 1-1/2 clutches, I finally decided to swap transmissions on my e30 s52 , getrag 240 to get some better clutch options. Looking at real oem and actual pictures of these transmissions they seem to be the same, bmw even has the same price to the penny on these. I know this has got to be a common swap but I can't seem to find much info on why not just use e90,e60,z4 version. Its much more available and cheaper. Please shed some light on this for me or point me to an information source.
Thanks

[Vincenze]

Only the GS6-37BZ will match the tilt angle of your engine.

You should compare the bellhousings, the length of the transmission shaft, and the placement of the pilot bearing: in the freewheel or inside of the trasmission shaft.

Find Jordan's threads where he installed the transmission from a Z4.
https://www.bimmerforums.com/forum/s...6SPD-Build-Log

https://www.r3vlimited.com/board/forum/general-forums/members-rides/the-project-forum/335697-project-lessmeister-91-318is-restomod-w-mtech2-and-modern-drivetrain/page20

[Vincenze]

I don't know if the shifter arm from the E36 conversion will work.

https://www.zionsvilleautosport.com/store/bmw-e36-6-speed-conversion-shift-arm-support-bracket/

[Vincenze]

Could you research if the E90 bracket 22316760303 will work with the Bayside Fabrication 6-speed bracket?