Thread: 3.23 to 3.73 differential swap DIY AKA poor man's supercharger
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      09-18-2020, 05:44 PM   #73
NA64LIFE
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Drives: '12 128i Msport
Join Date: Mar 2013
Location: Norcal

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Just picked up a 3.73 diff from a 2012 128 w/ 22k miles. Would you guys suggest changing out the seals before putting it in? Are our diffs known to leak?
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