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part number 1210421

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    part number 1210421

    My diff has part number 1210421. The tag has rusted out to oblivion.
    What diff do I have?

    The car is 1991 318i sedan.

    #2
    Jack up the rear of the car, spin the driveshaft and count the rotations. Spin the tires, if both spin same direction it's an LSD if not it's an open.
    1990 332i, 4 door
    2008 KTM 990 Superduke
    2018 Golf R, 6spd manual (Pending delivery)
    2017 Mazda CX-5 GT
    2007 Z4M Coupe - Sold to very nice people

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      #3
      Most likely a 4.10 open, but also what ^ said. If you post your rpm at 65 we could help you figure it out.
      The first car I ever rode in was an e30

      Originally posted by Cabriolet
      Wish you the best and hope you don't remember anything after 10pm.



      1992 Mauritiusblau Vert
      2011 Alpinweiss 335is coupe

      2002 540i/6 Black/Black
      2003 GSX-R 750 (RIP)

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