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  • Rear End Ratio RPO Codes Here

    GQ1 -- AXLE REAR, STD RATIO
    GT4 -- AXLE REAR, 3.73 RATIO
    GT5 -- AXLE REAR, 4.10 RATIO
    GU4 -- AXLE REAR, 3.08 RATIO
    GU5 -- AXLE REAR, 3.23 RATIO
    GU6 -- AXLE REAR, 3.42 RATIO
    G80 -- AXLE REAR, LIMITED SLIP (POSITRACTION)

    HC4 -- AXLE REAR, 4.56 RATIO

    I am finishing up a complete RPO code list that will soon be on my website, but I thought I would post these here for the time being.


    Brendan

    99 RCSB // 4.8 / 4l60E / Vette Servo / HPTuners / .218.227 - .525.525 hotcam / dropped torsion keys / 3.73 //
    PARTING OUT A 98 K1500 OBS - CLICK HERE FOR DETAILS

  • #2
    Excellent! I have the 3.73, L/S. It would be nice to know what all those codes mean.

    Comment


    • #3
      Just Wondering....
      Where Can you find these codes on the truck ?

      2000 Chevy 4x4 (SOLD)
      2005 Z71
      2007 GMC Yukon Denali

      Comment


      • #4
        Open Your glovebox and look inside it. Should be a list of codes on the bottom.
        2006 K1500 Vortec Max CCSB 6.0 4.10's, Nelson SD Tune, Trick Turbo kit T76 @ 8psi, 60lb/hr injectors, 4" duramax exhaust, snowmeth stage 2 kit, FLT Level 5 4L70E, Vig 2600, 40K trans cooler. 13.2 @ 100.5mph 1.8 60ft

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        • #5
          Yeah, just look in the glovebox. It's just a little sticker with a list of 3 letter codes which are all of the options your truck came with.


          Brendan

          99 RCSB // 4.8 / 4l60E / Vette Servo / HPTuners / .218.227 - .525.525 hotcam / dropped torsion keys / 3.73 //
          PARTING OUT A 98 K1500 OBS - CLICK HERE FOR DETAILS

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          • #6
            u can get it with a 4.56 ratio factory?
            1998 Chevy Silverado EXT Cab Red. 33x12.50x15 Dunlop Mud Rovers 4"-6" Rancho Lift and Dual Exhaust

            Comment


            • #7
              Originally posted by SierraMan
              u can get it with a 4.56 ratio factory?

              they came in alot of military issue stuff :read:
              6.0 Swap, Powerdyne supercharger, SFA, 44" boggers, some other stuff

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              • #8
                Yeah, they came in the military trucks



                Brendan

                99 RCSB // 4.8 / 4l60E / Vette Servo / HPTuners / .218.227 - .525.525 hotcam / dropped torsion keys / 3.73 //
                PARTING OUT A 98 K1500 OBS - CLICK HERE FOR DETAILS

                Comment


                • #9
                  Originally posted by Sambo
                  Open Your glovebox and look inside it. Should be a list of codes on the bottom.


                  Thanks...

                  Went and took a look in the glove box and found it.
                  G80.......from your list that would be the Limited Slip (posi)
                  does this have a gear ratio?.......

                  Hopefully this isnt a dumb Question...

                  2000 Chevy 4x4 (SOLD)
                  2005 Z71
                  2007 GMC Yukon Denali

                  Comment


                  • #10
                    I'm not sure what gear ratio that would be. I'm guessing it could be 3.73? I'll do a little research in the morning and see what I can come up with.



                    Brendan

                    99 RCSB // 4.8 / 4l60E / Vette Servo / HPTuners / .218.227 - .525.525 hotcam / dropped torsion keys / 3.73 //
                    PARTING OUT A 98 K1500 OBS - CLICK HERE FOR DETAILS

                    Comment


                    • #11
                      You should also have a code for a ratio. The G80 is just the limited slip, and has nothing to do with ratio. I think G80 is actually a locking diff, but i'm not sure

                      Comment


                      • #12
                        Originally posted by crh428
                        You should also have a code for a ratio. The G80 is just the limited slip, and has nothing to do with ratio. I think G80 is actually a locking diff, but i'm not sure
                        that thing is crap :LOL: i hate my G80 it never locks when i want it to
                        6.0 Swap, Powerdyne supercharger, SFA, 44" boggers, some other stuff

                        Comment


                        • #13
                          That sux. Mine works great all the time.
                          1997 Chevy K1500 Z71
                          K&N Intake, 3.73, True Duals

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                          • #14
                            Mine does too, and i checked, it is a posi, not a locker

                            Comment


                            • #15
                              I can't seem to find the rear end code in my '01 tahoe. I see the big list of 3 digit codes in the glove box, but not one of them even start with a "G". Any help?

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