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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > All-Wheel-Drive (Xi / xDrive) Talk > Front diff vs transfer case



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      09-17-2020, 04:57 PM   #1
WillAZ
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Drives: 2007 BMW 335Xi
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Location: Arizona

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Front diff vs transfer case

I have a 2007 BMW 335xi manual transmission. I recently replaced the front driveshaft, the U joint was really loose, and the front right axle because of a clunk I would hear on slow speed tight turns. I took it for a drive after the axle replacement and did a spirited rolling start takeoff and I heard a pop and high speed whine, immediately got off the throttle, drove a little and tried again to accelerate much less spirited and still heard the whining noise. I drained the front diff and transfer case and got pretty clean oil from the front diff no metal, and somewhat dirty oil from the transfer case (I just replaced the oil less than a couple hundred miles ago), but no metal. I was thinking front diff since that is what a lot of posts indicate, but now I'm wondering if its the transfer case not engaging the drive shaft fully? Any ideas?
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