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The BMW E46 ///M3 is the M version E46 and puts out an amazing 333 HP and 262 lb-ft of torque at stock specs! There are an amazing amount of modifications for both the coupe and convertible models so read up and get started modifying your cars today!

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Old 02-04-2019, 07:51 AM   #1
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Upgrade to 2 Clutch LSD & 4.10 gears?

My 02 M3 differential went totally bad at 70k miles. The replacement differential is quite expensive, so I looked into used options and rebuilt options. I have read that upgrading the differential can be one of the best ways to put down power. Should I upgrade the LSD to a rebuilt one with a 2 clutch LSD and 4.10 gears? I'm thinking I will be paying the labor no matter what so maybe I should go all in. Does anyone have experience using an upgraded LSD such as a 2 clutch LSD or using 4.10 gears?

Last edited by markfitz14; 02-04-2019 at 01:58 PM.
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Old 02-06-2019, 07:41 AM   #2
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The clutch style LSD on earlier BMW's (E34 M5, E39M5 and others) are, in my opinion, a much better set up for our M3. If you can track down a used one, have it rebuilt, or rebuild it yourself, I think you'll be much happier than re-doing the stock E46 M3 GKN limited slip.

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Old 03-20-2019, 11:10 AM   #3
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The E39 M5 ring and pinion are compatible because they are 210 mm as in the E46 diff, but the case is not the same size.
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Old 04-23-2019, 10:58 PM   #4
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If I am not mistaken the OEM M-Variable differential comes with two clutches. Somebody correct me if I am wrong. I remember reading up on it on the spec sheet.
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Old 06-09-2019, 11:42 AM   #5
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Originally Posted by jbarajas19 View Post
If I am not mistaken the OEM M-Variable differential comes with two clutches. Somebody correct me if I am wrong. I remember reading up on it on the spec sheet.
You are mistaken sir. The M-variable is a different architecture than the more traditional ZF family lsd's such as the e39m5 and previous generations of diffs, which mostly have only 2 clutches.
Let me know if you need any diff work or parts!
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