S8 Quattro Sedan V10-5.2L (BSM) (2009)
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Remove the bolts - arrows B -.
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Lower the rear final drive carefully until the flange/driveshaft is accessible.
Measure Dimension a and dimension b.
‹› Distance between the flange and the pinon = dimension a
‹› Distance from the flange to the nut on the pinion = dimension b
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Write down the dimensions.
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Mark the location of the pinion nut on the pinion - arrow -.