People who have their transfer case gear worn got this trifecta. Just my knowledge. A more rubust design sold on Amazon (not sure if still available) is $50. I changed mine, just as a preventive.

Good Luck!

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01' 3.0i E53 (M54) with 164,000 miles
07' 3.0si E83 (N52) with 134,000 miles
08' 3.0si E70 (N52) with 91,000 miles