Thread: M3 LSD in 135i
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      03-01-2017, 04:27 PM   #42
vtl
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Drives: 2008 BMW 135i MT
Join Date: Apr 2015
Location: Melbourne, Australia

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Quote:
Originally Posted by Brule View Post
What's the benefit of a m3 diff and axles?
Benefits:
Proper locking differential - torque biasing units do not perform at all when the wheel is unloaded (except wavetrac). Have tracked the car quite a few times and you do find unloading the inside rear wheel happens a lot.

Much easier to rebuild - has a bolted ring gear and plenty of aftermarket options. Even the pumpkins aren't that expensive because of the amount of hassle it is to get it to work with non M cars

Axles and propshaft are much more heavy duty. Most 135i/335is came with 'inserted nut' propshaft->diff couplings which is like a tiny CV joint. Have seen plenty of people breaking this style coupling with hard launches. The side shafts are thicker as well.

Downsides:
Custom propshaft needed
The GKN viscolok diff will lose effectiveness as it gets older
Not that much cheaper than the other options

Honestly it was more work than I thought, and not worth the hassle. If I had to do it again, i'd just get a Difflab (QLD) pumpkin and swap out the diff in a weekend
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