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      12-05-2021, 10:55 AM   #3
rbryantaz
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Drives: 2007 E70 4.8i, 2008 E90 335i
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2008 BMW 335i  [7.67]
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Quote:
Originally Posted by roastbeef View Post
The goal is to add rigidity? What is the purpose besides a solid mount for the single lateral diff mount?
The goal is more to prevent the diff from being able to rotate more than just adding rigidity.

The 4th mounting point can greatly reduce movement in the diff without having to go with solid mounts which add a lot of NVH.

It will also eliminate movement even more than the solid mounts alone. Kits like the DEFIV which I think is discontinued included both solid mounts and the 4th mount point.

-Rich
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