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fast2002

will a 320i tranny fit a m20 engine?

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I got a 323 tranny and I read somewhere I think but not sure that a 320i tranny will bolt up to a 325i engine. I don't think it will but need to ask you guys. Thanks

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The E21 323 trans fits the M20, the 4 cylinder E21 320i trans does not fit. (outside the US, there was an E21 320 M20 engined car).

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Arrgh. Not directed at you fast2002. Just wish that the moderators would push the following post to the FAQ section.

http://www.bmw2002faq.com/component/option,com_forum/Itemid,50/page,viewtopic/t,274773/

The following is an excerpt from that post.

Transmission:

The euro market e21 323i 4 speed, getrag 242, aka m60 is an easy option -- as is the 5 speed version, the getrag 245. They are not as hard to find in the states as you would think. Several junkyards seem to have them. I found mine on Ebay for $75.

Using the 323i trans only requires hammering on the transmission tunnel. I used the shifter and platform from my 2002 4-speed and shortened the platform and the linkage to fit the stock hole in the tunnel. Now I get to keep my center console.

The E30 325 throw-out bearing IS different from the E21 throw-out bearing that came on the 323. There have been varying reports on which one to use. I'm using the 325 bearing because it made sense to me to use the one matching my flywheel. We'll see how it works.

To fit the E30 Getrag 260 (the transmission that came with your 2.5-2.7 M20 from the factory) would require major modification/welding to the tunnel. This transmission is fairly bulletproof but heavier than the 323 transmission. The front half of a e30 driveshaft would have to be grafted onto the 2002 driveshaft. It also lacks a mechanical speedometer hookup (It works electronically on the e30). A shifter hole may have to be cut farther back in the tunnel.

Quick trans run down (from Ben Thongsai?):

Stock 2002 4 spd: Getrag 232

Stock 320i/323i 4spd: Getrag 242, but the bellhousing is different depending on which motor it is attached to

E21 320i 5spd: Getrag 245 for 80-early 83 models

E21 323i 5spd: Getrag 245, but different bellhousing from the 320i trans, this is the trans most people want for an M20 conversion, it's small enough to fit in the 2002 tunnel, is a 5 speed, and has a speedo drive

E21 320i 5spd: Getrag 240 for the late 83 models, has the 2 piece case

E30 318i 84-85: Getrag 240 same as '83 320i but with no speedo drive and dual rear trans mounts (note that some '84-'85 318i's came with a ZF trans that is completely different)

E30 318i/is '91: Getrag 240 but with a bellhousing that fits the M20/M50/M42 motors, no speedo drive with dual rear mounts. You can mix and match this trans with the '83 320i trans and get a Getrag 240 that bolts to an M20/M42 and has a speedo drive.

E30 325/e/i/is: Getrag 260, bigger than any of the above transmissions, no speedo drive. Doesn't fit the 2002 tunnel very well without some "help." E28 528e '83-'88 also used this transmission, as well as '89-'90 E34 525i.

E28 528e '82 only: Getrag 265, bigger yet than the Getrag 260, but near indestructible under most usage, detachable bellhousing, has a provision for a speedo drive, will bolt up to an M20/M50/M42, good luck getting it to fit in an '02 tunnel without major surgery. (unless you have an automatic shell, then it's more likely)

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