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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Tue, Dec-04-2018, 05:45:56 AM   #31
terraphantm
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Default Re: Cheapest Trans Swap

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Originally Posted by 04yfz View Post
The getrag was too large to fit in the chassis.
I've never seen any definitive proof of that. The getrag isn't really any bigger than the ZF. BMW probably just wanted to switch to a more modern transmission rather than one that dates back to the 80s
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Old Tue, Dec-04-2018, 03:57:19 PM   #32
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Default Re: Cheapest Trans Swap

Which transmission is capable of handling more power/torque? The ZF or Getrag?
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Old Tue, Dec-04-2018, 05:41:32 PM   #33
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Default Re: Cheapest Trans Swap

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Which transmission is capable of handling more power/torque? The ZF or Getrag?
Getrag is rated for more torque. Some of the ZFs that came on the newer / higher torque models are rated for more torque than both, though I don't think any of those have an M5x/S5x compatible bellhousing. There's a guy on bimmerforums selling an E36 swap kit for the 335 transmission, and its bellhousing adapter would work (though I don't know if that'd add too much length to use the 330 mounts and such)

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Old Tue, Dec-04-2018, 06:09:36 PM   #34
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Default Re: Cheapest Trans Swap

ZF GS6-53 is rated for 530 NM and can hold more since BMW put it behind the F10 M5 turbo V8, but needs an adapter plate to fit. GS6-37 from 330i and E60 530i bolts up but only 370 NM. 420G is 420NM.

A ZF320 5 speed is rated for only 320NM but will hold much more. People use them in turbo E36 with 400+ lbs rwtq reliably. BMW put it behind the S54 in the Z3 S54 M Coupe, which was slightly detuned, but still made over the torque rating of the trans.

ZF GS6, Getrag 420G and ZF320 all have different input splines so different clutch disks are required. Also factor in possible driveshaft costs and possible clutch linkage costs if changing from a 420G.
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Old Tue, Dec-04-2018, 06:38:02 PM   #35
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Default Re: Cheapest Trans Swap

GS6-37 shouldn't need a different driveshaft - the length difference is within the tolerance of the CV joint
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Old Tue, Dec-04-2018, 10:06:18 PM   #36
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Default Re: Cheapest Trans Swap

Or the middle slip joint. But GS6-37 may have a 188 diff flange that is not the same. Or may have a different size front end flange. Don’t know. But if just one end differs maybe you can mix and match.
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Old Tue, Dec-04-2018, 10:09:09 PM   #37
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Default Re: Cheapest Trans Swap

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Originally Posted by pbonsalb View Post
Or the middle slip joint. But GS6-37 may have a 188 diff flange that is not the same. Or may have a different size front end flange. Donít know. But if just one end differs maybe you can mix and match.

Both ends of the DS are the same across most if not all of the e46 models.


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Old Tue, Dec-04-2018, 10:19:04 PM   #38
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Default Re: Cheapest Trans Swap

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Originally Posted by pbonsalb View Post
Or the middle slip joint. But GS6-37 may have a 188 diff flange that is not the same. Or may have a different size front end flange. Donít know. But if just one end differs maybe you can mix and match.
Transmission output flange is the same on the GS6-37 and is positioned almost exactly the same as the 420g (I think it's a <5mm difference). You'd just use the M3 driveshaft when installing in an M3 (the diff flange is the same size regardless, but the M3 driveshaft is shorter because the M3 diff sits a bit further in).
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Old Wed, Dec-05-2018, 10:06:13 PM   #39
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Default Re: Cheapest Trans Swap

Here is a 420G with 80k for $1300.

https://www.bimmerforums.com/forum/s...46-M3-6sp-420g
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Old Fri, Dec-07-2018, 09:35:35 PM   #40
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Default Re: Cheapest Trans Swap

I have a 420G posted here for $1750, which has had no interest. It's a no-issue spare unit from our race car, which means it's regularly maintained. It's your for $1275 shipped if you're interested. You can reach me at olivier@raoust.com
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Discussing Cheapest Trans Swap in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)