Quote:
Originally Posted by Brule
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