78 Buick Estate Wagon Rear End Ratio

Discussion in 'General Station Wagon Discussions' started by dmfconsult, Nov 7, 2017.

  1. dmfconsult

    dmfconsult Well-Known Member

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    Hoping someone might have this information handy, as I'm trying to identify the rear end in my 78 Estate Wagon. I suspect it's the standard 2.73 but want to be sure... The stampings on the axle are "2YJ P185D". I can decode that it is a Pontiac sourced rear end built during dayshift on July 4, but the 2YJ is what is stumping me. Here's a pic of the stamping:

    All I can find online is a reference to RPO codes (which I will get next time I'm at the car's winter storage). Thanks in advance!
    IMG_3391.JPG
     
  2. dmfconsult

    dmfconsult Well-Known Member

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    Thanks for looking guys, but I've been able to confirm that 2YJ decodes to a 3.08 non-posi rear.
     

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