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Thread: Rear End Ratio RPO Codes Here

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  1. #1
    Blazer drivin' mofo Loudnfast91's Avatar
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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

  2. #2
    Registered User Uranium-235's Avatar
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    Excellent! I have the 3.73, L/S. It would be nice to know what all those codes mean.

  3. #3
    AKA Hollywood 00chevy4x4's Avatar
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    Just Wondering....
    Where Can you find these codes on the truck ?

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

  4. #4
    Trucknut Sambo's Avatar
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    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

  5. #5
    Blazer drivin' mofo Loudnfast91's Avatar
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    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

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    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

  7. #7
    i still lurk Luke2kZ71's Avatar
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    Originally posted by SierraMan
    u can get it with a 4.56 ratio factory?

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

  8. #8
    Blazer drivin' mofo Loudnfast91's Avatar
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    Yeah, they came in the military trucks



    Brendan

  9. #9
    AKA Hollywood 00chevy4x4's Avatar
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    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

  10. #10
    Blazer drivin' mofo Loudnfast91's Avatar
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    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

  11. #11
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    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

  12. #12
    i still lurk Luke2kZ71's Avatar
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    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

  13. #13
    Registered User JamescZ71's Avatar
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    That sux. Mine works great all the time.

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

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    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?

  16. #16
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    Write them all down and go here:

    http://www.thirdgen.org/cgi-bin/rpo/index

  17. #17
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    GU6 G80

    Wow. According to that, I have a 3.42 posi.

    I'd sure like to stick that rear end under my Malibu and put the 3.73 from the 'bu in the truck.

    Thanks, Brendan.

  18. #18
    Blazer drivin' mofo Loudnfast91's Avatar
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    No prob, Bob.



    Brendan

  19. #19
    trucknut? can't find 'em daigle's Avatar
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    do these codes work for an 86' truck?

  20. #20
    Blazer drivin' mofo Loudnfast91's Avatar
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    I'm not sure if these codes will work for an 86 or not. Anybody have any ideas?




    Brendan

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