What Size Rear Do I Have

Discussion in 'Maintenance & Upkeep' started by davedyno, Jan 31, 2014.

  1. davedyno

    davedyno Member

    What size rear, what Trans do I have. I would like to order on line like GM Part Direct. I gave them my Vin # they say rear cover gasket has 14 Holes, I count 10 Holes.
    I would like to order Trans Filter, Pan Gasket, rear end cover gasket.

    2011 Silverado Ext 4X4, 5.3, Z71,Z85 Pkg, 6 speed auto,trailering Pkg,Trailer Brake Controller, 18" Wheels

  2. Dana W

    Dana W Rockstar 3 Years 500 Posts

    Sorry, I can't really help you but the title of your thread made my day a little better. I am still laughing a little now.

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

    Dave, on your Trans.....it is the 6L80e 6-SPEED AUTO/TRANSMISSION, the RPO Code is "MYC"......and with Counting 10-Bolts, your Rear Diff would look like this one below.


    The GM 8.6" Rear, '09 & Up. Has 10 Bolt Cover and 30 Spline C/Clip Axles.

    Ring Gear Diameter: 8.500
    Cover Bolts: 10
    Ring Gear Bolts: 10
    Spline Count: 30
    Dropout: False
    Pinion Support: False
    Carrier Breaks: 2.56 / 2.73
    Rear Suspension: Solid
    Pinion Nut Size: 1-1/4

    Link/for Rear Diff Information

    Dave go to the Link Below, and Enter your Trucks Vin #Number, and it will show you everything it Came with from the Factory, along with the all of the RPO Codes.
    Last edited: Feb 1, 2014
  4. McClintoc

    McClintoc ɹoʇɐɹǝpoɯ Staff Member 3 Years 1000 Posts

    Did you buy your truck new or pre-owned? If new, do you still have the window sticker? See if it says on there what rear end you have.
  5. davedyno

    davedyno Member

    Thanks 99' HEARTBEAT. Great information


    - - - Updated - - -

    After I read my own post, I see what you mean. I'm laughing too.

    - - - Updated - - -

    I still have window sticker, it say's rear axle 3.42, locking rear differential. 99'HEARTBEAT have the info I needed.

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

    Also Inside your Glove Box is a White Tag/Sticker....which is the Service Parts I.D. Tag(Pictured Below)and on it you will see your Vehicles Vin # Number and a Series of Letter's and Number's which are RPO Codes.....which stands for Regular Production Options...In Short its what your Vehicle came with from the Factory,

    the Service Parts Identification Label



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