1990 325is M30B35 swap Transmission question!

[Gullrock]

Im in the middle of gathering all th parts needed to this swap and i bought a M30B35 engine and transmission, E34 throttle cable, and a E28 535i radiator to get started, and i am hoping that the m30 tranny is what i needed to do this swap? can anyone help me with this? thanks

[PimpinWalrus]

Yes, if the tranny came with the engine, that will work. You will either need to swap your output flanges from an m20 g260 or find a big giubo driveshaft from a 328i e36 or early eta.

[EatsHondas]

Yes, if the tranny came with the engine, that will work. You will either need to swap your output flanges from an m20 g260 or find a big giubo driveshaft from a 328i e36 or early eta.

This is correct. I decided to swap my transmission output flanges. No driveshaft modifications necessary. For what it's worth, the e30 throttle cable works perfectly with no modification.

Also, the M30B35 uses a dual mass flywheel from the factory. A singlemass flywheel and accompanying clutch kit from any M30B34 (and a few other specific M30 variants) can be swapped in. They'll noticeable improve throttle response and remove a lot of rotating mass from the drivetrain.

For example, I chose to go with a lightened B34 single mass flywheel and a Sachs (OEM) clutch kit for an e28 m5. HIGHLY recommended obviously: relatively cheap, factory driveablility, zero custom bullshit, and plenty of holding power for N/A or even low boost.