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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 Thu, Aug-15-2019, 05:25:23 PM   #1
hooptie157
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Default SMG Transmission Question - will it fit in an already manual M3?

Hello,

Hypothetically if I needed to replace a transmission in a manual M3 could I use an SMG transmission and just remove the pump? I know its the same tranny but wasn't sure what modification were needed.

I ask because I suspect the SMG tranny would be in munch better condition (syncos, clutch etc) because the computer was doing the shifting plus they are much cheaper online.

Let me know thanks!
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Old Thu, Aug-15-2019, 05:29:11 PM   #2
Texaz3
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Default Re: SMG Transmission Question - will it fit in an already manual M3?

Yes, need bell housing from a 6MT though.
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Old Thu, Aug-15-2019, 05:32:16 PM   #3
hooptie157
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Default Re: SMG Transmission Question - will it fit in an already manual M3?

Quote:
Originally Posted by Texaz3 View Post
Yes, need bell housing from a 6MT though.
Oh yeah I'd be removing a manual tranny so I'd have the complete tranny and parts to work with. I'd probably throw a RTD or CAE in at the same time.

so just swap the bell housing and remove the pump?
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Old Thu, Aug-15-2019, 05:32:35 PM   #4
tjkenny15
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Default Re: SMG Transmission Question - will it fit in an already manual M3?

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Originally Posted by Texaz3 View Post
Yes, need bell housing from a 6MT though.
Or, you can have the SMG bell housing machined and converted to a manual bell housing.
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Old Thu, Aug-15-2019, 05:34:16 PM   #5
hooptie157
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Default Re: SMG Transmission Question - will it fit in an already manual M3?

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Originally Posted by tjkenny15 View Post
Or, you can have the SMG bell housing machined and converted to a manual bell housing.
Id have the bell housing for the existing Manual Tranny. So basically I'm good to go right?
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Old Thu, Aug-15-2019, 05:41:51 PM   #6
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Default Re: SMG Transmission Question - will it fit in an already manual M3?

Also is there a DIY for the transmission removal?
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Old Fri, Aug-16-2019, 01:46:21 AM   #7
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Default Re: SMG Transmission Question - will it fit in an already manual M3?

I did exactly this, replaced a six speed in bad shape with a low milage SMG, it has been flawless, read the swap threads, it will show you what you need to do, swap bell housing and tap a hole for the gear position sensor.
http://www.m3forum.net/m3forum/showthread.php?t=444126
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Old Fri, Aug-16-2019, 03:51:05 AM   #8
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Default Re: SMG Transmission Question - will it fit in an already manual M3?

If you are going with an RTD or CAE self centering shifters, you don't need to swap the bellhousing or machine the smg bellhousing...

You will need to tap (make threads in the aluminum housing) in the blind plug on the smg tranny to be able to thread in the gear position switch.

You also need to get parts 8,9,10 from a manual (link below) and swap them into the smg tranny. https://www.realoem.com/bmw/enUS/sho...diagId=23_0887

In short, yes, very easy to swap the trannies, but positions of some of the sensors are a bit different (reverse sensor and gps), but easy to make work with 6mt wiring and change a pin.

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All DIY: VANOS, WPC rod bearings, full SS (SS stepped V1 headers, catted S1, stock S2, SS sport), AFD E85 Proflex kit, Ohlins R&T/Hyperco 375f Swift 672r/GC street tops and camber plates, ST40 355 pfc08, 330 ZHP steering rack, diffsonline 4.1 diff with rem polish, E60 short shifter lever, AKG black diff bushings/subframe bushings, Rogue rtab, Sachs clutch/flywheel, rear main, Beyer driveshaft, valve adjustment, cooling refresh.

Happy to help with VANOS or any other DIY job around NorCal. Have various specialty tools (VANOS, RTAB, engine bar, valve adjustment, tranny jack, ball joint separator, pilot bearing puller, tap&die kit, etc).

Last edited by mrgizmo04; Fri, Aug-16-2019 at 04:01:17 AM.
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Discussing SMG Transmission Question - will it fit in an already manual M3? 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)