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Calculer son ratio de différentiel

Unfortunately we don't keep a record of the diff ratios that were fitted to rolling chassis.  In theory this should be shown on a tag found under one of the rear cover bolts but these can often be missing.  You can of course always establish the ratio empirically by marking the input and output flanges and counting the number of input rotations to produce one output rotation.  Obviously you need to make sure that both output flanges rotate in unison as you do so.  The diff breather tube should be positioned to prevent water ingress.
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