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Old 10-26-2010, 04:59 PM   #5
xi_ter
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Join Date: Nov 2006
Location: Edmonton, Canada
Posts: 2,220
My Ride: 2003 325xi
The main difference is that there is a transfer case right in the middle of the car between the 2 drive lines. This stiffness between the front and rear differentials prevents the subframe movements in the RWD that cause the failures. Take a look under your xi and you'll see the strength from building the drivetrain this way.
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