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Rear End Ratio RPO Codes Here

This is a discussion on Rear End Ratio RPO Codes Here within the Technical / Maintenance forums, part of the General Discussion category; Ok, I'm confused, the rpo code lists here says the g80 is a posi/limited slip but another site says g80 ...

  1. #61
    Registered User enine's Avatar
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    Re: Rear End Ratio RPO Codes Here


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    Ok, I'm confused, the rpo code lists here says the g80 is a posi/limited slip but another site says g80 is a locker and g86 is the posi/limited slip. Is it possible that its different for different years? Sounds like the G80 isn't very good either way so maybe I should keep the lock right from my old truck and put it in this one.
    2004 Silverado ECSB 5.3L z71
    1982 Palomino Bronco 186
    1991 Specialized Rockhopper
    2009 Giant Cypress DX

  2. #62
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    Re: Rear End Ratio RPO Codes Here

    On my 1982 1/2 4x4 the code is gq1 which i know means standrad axle cany one tell me the gear ratio i looked everywhere

  3. #63
    Administrator 454ss's Avatar
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    Re: Rear End Ratio RPO Codes Here

    Quote Originally Posted by Mcgwirejh
    On my 1982 1/2 4x4 the code is gq1 which i know means standrad axle cany one tell me the gear ratio i looked everywhere
    This is all I got from the GQ1 so see if you find any of this codes listed below.
    GQ1 : AXLE, STD RATIO
    GS1 : AXLE REAR, 2.73 RATIO
    GS3 : AXLE REAR, 3.73 RATIO
    GS4 : AXLE REAR, 3.70 RATIO
    GS5 : AXLE REAR, 4.11 RATIO
    GS6 : AXLE REAR, 4.56 RATIO
    GT1 : AXLE REAR, 2.56 RATIO
    GT2 : AXLE REAR, 2.29 RATIO
    GT4 : AXLE REAR, 3.73 RATIO (DUP WITH 5 X 1)
    GT5 : AXLE REAR, 4.10 RATIO (DUP WITH GT8)
    GT7 : AXLE REAR, 3.33 RATIO
    GT8 : AXLE REAR, 4.10 RATIO (DUP WITH GT5)
    GTY : AXLE, WIDE TRACK
    GU1 : AXLE REAR, 2.41 RATIO
    GU2 : AXLE REAR, 2.73 RATIO

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  4. #64
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    Re: Rear End Ratio RPO Codes Here

    How can I find out what kind of rear axle I have? I have a 2001 silverado 1/2 ton 2wd and disk brakes. It has ten bolts on the differential and seems to measure 10.5 inches O.D. Everything I have researched about the half tons appear to have 8.5 rear ends. So im confused about what it may be. I also know its has 3.42 gear ratio and no limited slip or locker. Please help, im looking to get 32" or 33" inch tires and 3.73 gears or 3.90. If anyone has any knowledge of this combination please help me make the right decisions. My V8 truck is slow as **** off the start so I need lower gears. However I dont want to be to low in gear that I am running 3000 rpms at 70mph. Please help!

  5. #65
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    Re: Rear End Ratio RPO Codes Here

    Okay, as my luck would have it i looked in my glove box to find out my gear ratio and sure enough it was worn down. I was just wondering if there is another way to find the list of these codes. Thanks in advance.

  6. #66
    Mark
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    Re: Rear End Ratio RPO Codes Here

    Wow I have 3.42's, and I was told i had 3.08's. Thanks!

    -Mark
    Belltech 2/2 | Vortec longblock | GMPP intake | bored 2" TBI | 2500 stall | stock 3.42's | Hooker LT's | Bullets | 8k HID | 5% tint

  7. #67
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    Re: Rear End Ratio RPO Codes Here

    I am new to the forum so excuse if i do something stupid.

    I have a 2005 Silverado 1500 auto with the 5.3 motor. It presently has the 3.23 gears and i am wanting to goto 3.90.

    I am not sure if its a 10 bolt, 8.5, whatever, can anyone assist me? Considering the Richmond 3.90 with installation kit for about $300. Have someone who will install for $200. This sound like a good deal?

    Nick

  8. #68
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    Re: Rear End Ratio RPO Codes Here

    Quote Originally Posted by Loudnfast91
    I'm not sure if these codes will work for an 86 or not. Anybody have any ideas?




    Brendan
    yes these work for old stuff too.

    rpo codes date back to 1958. some rpo(rolling production order) codes become cars, like the Z28. L codes are engines, j codes are brakes.

    g80 dates back to the 1970 camaro and continues to present day.
    1992 chevy 1/2 ton extended cab, 350, 3.73's(g80), 188rwhp(soon to be 300 )
    used to tow:
    1974 Camaro Z28 454 full wieght best time of 11.2 @ 121mph on the bottle.

  9. #69
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    Re: Rear End Ratio RPO Codes Here

    Quote Originally Posted by crh428
    Mine does too, and i checked, it is a posi, not a locker
    Actually, G80 is an Eaton locker. It is a centrifugal force type. You can see it on Eaton's website. There is a different code for plain limited slip. My HD has the G80 with 4.10 gears.

  10. #70
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    Re: Rear End Ratio RPO Codes Here

    I just took a peak in my truck and i have the G80 rear end....do you know a website where i can look up teh rest of the codes???? that is some nice info to have..i love my posi i have never had any problems with it..does any one know why some came with it and some didnt??? thank guys

  11. #71
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    Re: Rear End Ratio RPO Codes Here

    Quote Originally Posted by nhgoodrich
    I am new to the forum so excuse if i do something stupid.

    I have a 2005 Silverado 1500 auto with the 5.3 motor. It presently has the 3.23 gears and i am wanting to goto 3.90.

    I am not sure if its a 10 bolt, 8.5, whatever, can anyone assist me? Considering the Richmond 3.90 with installation kit for about $300. Have someone who will install for $200. This sound like a good deal?

    Nick
    Make sur you order gears for a 90-99 8.5" ringgear 10 bolt reaend. The older gears will fit your 8.6" rearend. If you order the newer gears, they are almost impossible to install, CORRECTLY. They use MUCH closer tolerances in the 8.6 rear, it is much easier to use the older gears. I suggest Richmond gears, much better than GM gears, lots stronger. I had a set of 4.10's that survived over 200 1/4 mile passes and 3 exploding carriers and the digested multiple meals of spider gears.
    97 GMC 2wd RCSB 5.7, s10 2700 footstall, Hooker 24621hkr LT's , 2.5" cats dual 4"pipes exit B4 pass. side tire, custom driveshaft 3.42 G80 FIPK MAF descreen GM/Mercruiser Marine intake manifold 29lb LS2(EV6) injectors Ed Wright PCM(best mod), LT4 KM 14.8@94mph 2.007 4000lbs 122mph

  12. #72
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    Re: Rear End Ratio RPO Codes Here

    what's the GQ-standard=ratio,i got one in a 82 stepside i just bought[not running]just wondering what ratio it is without tearing down.anybody know?dealership no help as usual!thanks

  13. #73
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    Re: Rear End Ratio RPO Codes Here

    nice. i'm running
    GU6 -- AXLE REAR, 3.42 RATIO
    G80 -- AXLE REAR, LIMITED SLIP (POSITRACTION)

    on a 96 silverado
    1990 Silverado - 350 TBI Regcab/stepside
    1996 Silverado - 350 Vortec Extcab/short-fleetside

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  14. #74
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    Re: Rear End Ratio RPO Codes Here

    I have GT4 : AXLE REAR, 3.73 RATIO (DUP WITH 5 X 1) what does the DUp with 5x1 mean??

    Thanks
    Last edited by macojoe; 08-22-2005 at 09:40 AM.

  15. #75
    Registered User ayev8r's Avatar
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    Re: Rear End Ratio RPO Codes Here

    What years does this cover?

  16. #76
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    Re: Rear End Ratio RPO Codes Here

    I have the same code(GQ1) on my 81 1/2 ton, the rear end is out and I need to find another one. If you find anything out let me know, I could use the help.

  17. #77
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    Re: Rear End Ratio RPO Codes Here

    Mine has 3.73 POSI
    I dont mind that at all
    :fsc:
    98 Chevy K1500 5.7 Vortec, 7" Lift, 4:11's

  18. #78
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    Re: Rear End Ratio RPO Codes Here

    Quote Originally Posted by P379XL
    Well, I guess I know why I run 2900 RPM @ 70 MPH. I have 3.42's and 27" tires...
    Are you hunting for gears as you drive....like back and forth between gears and are you sure you are in OD. If you don't have the torque to push those big tires and have a tranny that is computer driven then you may be running in third. I'm sure you checked that but thought I'd mention it just in case.

    Here's a site for identifying rears and other stuff to help you: http://www.drivetrain.com/dana44.html#SPECIFICATIONS

    How far back to those codes go BTW?
    Last edited by jobberone; 10-03-2005 at 09:31 PM.

  19. #79
    ryde ak chevy_js's Avatar
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    Code on 01 Z71?

    just bought my 01 half ton, found the code in the box, and i have the GT5 with the G80. Wierd. i'm wondering if anyone has ever had a misprint on the sticker. Also anybody else out there with a Z71, how fast are you going in OD @ 2000rpm? that would solve the problem if i knew that. I go about 64-65 mph. I have never heard of a 4.10 stock in a half ton and would bet money that mine actually doesn't have one. I'll probly do the tire rotation test.

  20. #80
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    Re: Rear End Ratio RPO Codes Here

    Yes 2000 at about 40 mph
    2002 Chevy Silverado Z71, 4.8 4X4 EXT Cab, 3.73 gears(GT4). With 2" lift, via rear leafs from a 2500, & cranked T Bars


 

 
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