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How do i know what kind of rear differential I have?

Discussion in 'Chevy Truck Talk & GM News' started by DSKMAN, Jan 5, 2012.

  1. DSKMAN

    DSKMAN New Member

    I have a 2002 extended cab silverado that is 2wd and i want to know what my rear diff situation is so i can maybe buy a locker or a positraction rear diff to help with winter (i live in wisconsin) so if anyone knows where i can find out what i have (without doing a burnout and seeing how may wheels spin haha) it would be greatly appreciated!
     
  2. billnorman

    billnorman Rockstar 100 Posts

    If I am not mistaken there should be a build sheet inside the glove box permanently affixed. Codes starting with the letter "G" are differential related.
     
  3. SurrealOne

    SurrealOne Former Member ROTM Winner 1000 Posts

    Yup. Check the RPO codes in the glove box and use a RPO lookup tool to determine what you have. This site has a number of such tools linked on it ... so you might use the 'search' function to find them. Happy lookups!
     
  4. 99'HEARTBEAT

    99'HEARTBEAT Epic Member Staff Member 5+ Years ROTM Winner 1000 Posts Platinum Contributor


    As mentioned above inside the Glove Box is a White Sticker....which is the Service Parts I.D. Tag, and on it you will see your Trucks Vin # Number and a Series of Letters and Number's which are RPO codes.....which stands for Regular Production Options...In short what your Truck came with from the Factory.


    To find out which Gears you have, you will be looking for the one Following,
    GU5........3.23
    GU6........3.42
    GT4........3.73
    GT5........4.10

    Also you going to be looking for RPO Code G-80, which is the, Limited Slip(Locker)
     
  5. aloxdaddy99

    aloxdaddy99 Rockstar 3 Years 1000 Posts

    If you don't have the sticker in the glove box you could look on or around the diff cover. It is usually stamped into the housing. Or there may be a tag that is bolted to the diff cover.
     

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