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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > Decided to fit a M3 diff



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      10-05-2010, 10:28 AM   #111
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Also does anyone know if just the diff cover for the M3 would fit the 335i diff.
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      11-06-2010, 03:57 PM   #112
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This thread should be a sticky Mr. 5
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      11-06-2010, 10:07 PM   #113
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Quote:
Originally Posted by marconi118 View Post
How did you jouned the M3 with the 335i shaft?

I have a complete M3 shaft, but I figured out that the 2 pieces are "female" so no way to join them?

Please ask you shop how they achieved exactly.

Pictures would be better... but at least a description how to do it would be great!
335i:


M3:

I would be willing to bet that they mated them at the U-joint...it would make the most sense. Just behind the bearing at the end of the front half shaft.
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      11-08-2010, 11:53 AM   #114
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Quote:
Originally Posted by mycoupe View Post
I would be willing to bet that they mated them at the U-joint...it would make the most sense. Just behind the bearing at the end of the front half shaft.
notice on the picture how the M3 part of the shaft (that comes from the LSD is female (it has a segmented hole in it) (near number 12 lower pict)

The 335i part of the shaft going to the gearbox is female too (near number 5 upper pict)

So now we need a double male piece similar to near number 8 upper to join both together, or maybe transform the M3 or the 335i part of the shaft in male...

We realy need pictures of GeorgeSmooth to understand how to do it. My M3 LSD is sitting in my garage for one year now
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      10-26-2011, 08:54 AM   #115
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did this topic have some development? i would like to do the swap and will find the dct diff, сv axles and driveshaft no prob, but still don't understand how those parts connect. i would rather fabricate the transmissionhub adapter, than shorten the driveshaft...
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      12-22-2011, 12:05 PM   #116
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Hi Guys
i am new in this post and call from germany? sorry about my english it is not so good

Just get the complete rear achs with side shaft, differential brakes... but dont have the driveshaft.

few weeks ago we change the differential from a bmw wich has a different head for the driveshaft. we change the old head to the new head, now the driveshaft fits to the car.

maybe i can put the head from the 335ia to the m3 differential? is it possibel? a new driveshaft is very expensive

thanks

kayhan from germany
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      12-23-2011, 05:23 AM   #117
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did nobody try it? dont want to devide my car just for testing
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      12-23-2011, 12:49 PM   #118
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This thread got lost somewhere...it was never fully documented with all the required info for the conversion. It would be great if you (or someone) could put together a pictorial guide with part numbers and customization required?
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      12-23-2011, 02:20 PM   #119
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great post! I had done some measuring and looked at photos, figured it would all fit and just now stumbled across this post. I much prefer the I6 motor, too bad they did not see fit to use an LSD and beefy axles on these cars from the factory!
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      12-23-2011, 02:22 PM   #120
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Quote:
Originally Posted by kayhan335iA View Post
few weeks ago we change the differential from a bmw wich has a different head for the driveshaft. we change the old head to the new head, now the driveshaft fits to the car. maybe i can put the head from the 335ia to the m3 differential? is it possible? a new driveshaft is very expensive
i recommend for you to contact http://www.driveshaftshop.com/ - frank rehak there is a genius when it comes to making driveshafts, and his prices are VERY reasonable
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      12-24-2011, 01:23 AM   #121
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Nice job man!
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      12-24-2011, 03:29 AM   #122
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what is the advantage of the M3 diff over the aftermarket one?
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      12-24-2011, 03:39 AM   #123
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Quote:
Originally Posted by Sigma 3 View Post
what is the advantage of the M3 diff over the aftermarket one?
Clutch type. And it's cheaper to find one from a wrecked M3
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      12-24-2011, 03:47 AM   #124
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It might be cheaper but it looks like there is some custom work involved, wich takes it above the $ point for the after market options or am I missing somthing
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      12-24-2011, 05:50 AM   #125
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Quote:
Originally Posted by Sigma 3 View Post
It might be cheaper but it looks like there is some custom work involved, wich takes it above the $ point for the after market options or am I missing somthing
The advantage in my books is that you get to use the beefier M3 driveshafts. As mentioned before I had the Quaife installed prior to the M3 diff and I do not notice any differences between the two.
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      12-25-2011, 10:36 AM   #126
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@GeorgeSmooth
i read you have a 335i with Automatik Transmission. Did you change the axle ratio too?My 335ia has i think 3,46 and the m3 diff from DCT dubble clutch has 3,15. that was longer then mine. i dont want to lose acceleration

someone in germany tell me that its possible to change the ratio. but at first i have to know how it will work with the driveshaft.

if the the connection from the diff is realy beafier than we have to change the driveshaft. hmmmm
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      12-25-2011, 11:13 AM   #127
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For general information, a good drive shaft shop can shorten a drive shaft and re-balance it in a matter of minutes (worth of work) and it is not very expensive.

Back in the day, we would have them fabricate new shafts, using the existing ends and it was never a problem. These guys do a lot more work with trucks and equipment, but the process is exactly the same, the shaft has to be straight and balanced to run smoothly.
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      12-26-2011, 12:30 PM   #128
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Quote:
Originally Posted by kayhan335iA View Post
@GeorgeSmooth
i read you have a 335i with Automatik Transmission. Did you change the axle ratio too?My 335ia has i think 3,46 and the m3 diff from DCT dubble clutch has 3,15. that was longer then mine. i dont want to lose acceleration

someone in germany tell me that its possible to change the ratio. but at first i have to know how it will work with the driveshaft.

if the the connection from the diff is realy beafier than we have to change the driveshaft. hmmmm
I initially used the 3.85 from the manual M3 diff. It was far to short and I was getting wheels spin right through 3rd gear. Then I swopped it out for the 3.15 and I am very happy with it.
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      01-02-2012, 01:17 AM   #129
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2011 BMW 335is  [3.03]
Wow I am suprised to find this thread. This is exactly what I am going to tackle soon. However I wont be salvaging parts.

Looking to swap out a 2011 DCT E92 335is final drive for a 2011 DCT E92N M3 final drive

The M3 driveshaft, DCT transmission output flang, right and left output shafts are going to supliment the swap. I am going to also get the drive flang hubs just in case also.

This should be easier as the DCT transmission is the same
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      02-02-2012, 11:55 AM   #130
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i'm going to receive the parts i need soon and hope to get you informed in couple weeks if i'm lucky .
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      02-06-2012, 03:14 PM   #131
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Quote:
Originally Posted by BuraQ View Post
Wow I am suprised to find this thread. This is exactly what I am going to tackle soon. However I wont be salvaging parts.

Looking to swap out a 2011 DCT E92 335is final drive for a 2011 DCT E92N M3 final drive

The M3 driveshaft, DCT transmission output flang, right and left output shafts are going to supliment the swap. I am going to also get the drive flang hubs just in case also.

This should be easier as the DCT transmission is the same
I will check the DCT diff on the 35 and take pics and we can then compare it to the one from the V8 DCT. Have both at home on cars. Unless you swopping the ratios only?
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      02-07-2012, 12:20 PM   #132
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m3 dct diff, axles, and drive shaft in a 335is dct still requires shortening the driveshaft.
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