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Differential ID tag? 1800 1970

posted by  Whale on  Fri Mar 12 15:45 CST 2021
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last visit: Fri Jun 14 19:52 CST 2013
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I just serviced my differential to change the lubricant. Apparently this year model doesn't have a drain plug mentioned in a manual, so the cover has to be removed to drain the oil. In doing so, I noticed a copper tag attached to one of the bolts that was stamped as: 43-10 and 4.30. Can anyone decipher what those numbers mean? Do one of the numbers identify this differential as "limited slip"? Thanks,








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    Differential ID tag? 1800 1970

    uid 60851's pic
    posted by  Grey245 on  Sat Mar 13 05:20 CST 2021
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    There's a simple test to determine the type of diff.
    Jack up the rear and put the axle on stands, make sure the wheels can turn freely.

    Grab one wheel and rotate it. If the other wheel rotates in the opposite direction, it's a normal diff. If it rotates in the same direction, it's a limited slip diff.








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      Differential ID tag? 1800 1970

      posted by  Whale on  Sun Mar 28 16:25 CST 2021
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      last visit: Fri Jun 14 19:52 CST 2013
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      Thanks for the LSD description to determine whether or not my diff is LSD or not. Jacked it up and spun the wheel and noticed the other wheel spun in the opposite direction = non-LSD.








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    Differential ID tag? 1800 1970

    posted by  c1800 on  Fri Mar 12 21:53 CST 2021
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    last visit: Sun Oct 5 19:37 CST 2014
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    4.30 is the diff gear ratio . All EFI 70-73 1800’s have this diff. I’m surprised you don’t have a drain plug on the diff. Same Diff from 70-73. No, that tag doesn’t mean you have an LSD. Maybe your rear end was swapped out by a PO?








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      Differential ID tag? 1800 1970

      posted by  planetman on  Sun Mar 14 23:02 CST 2021
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      last visit: Fri Oct 24 09:29 CST 2014
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      If an 1800E or 1800ES came with an M41 transmission, it came with 4.30 gears.

      If an 1800E or 1800ES came with a BW35 automatic transmission, it came with either 3.91 or 4.10 gears.

      And IIRC, we've seen some 1800E/ES disc brake rear ends that didn't have a drain plug.
      --
      Eric
      Hi Performance Automotive Service (formerly OVO or Old Volvos Only)
      Torrance, CA 90502
      hiperformanceautoservice.com or oldvolvosonly.com







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