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Differential?? 273s or 323s ???

This is a discussion on Differential?? 273s or 323s ??? within the Drivetrain forums, part of the LSx Technical Help Section category; ok...so...I'm not a mechanic...and even though I try to keep up with my tech as much as I can... I ...

  1. #1
    Puerto Rico LS1 Rikki_SeVeN's Avatar
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    Differential?? 273s or 323s ???

    ok...so...I'm not a mechanic...and even though I try to keep up with my tech as much as I can...

    I still have no Idea what Gears my rear end has... and what's the difrence between the gears...and what makes the 10-bolt so weak? or lesser to a 12-bolt or whatever?...

    So if I could get some clear cut answers or links to some good informational reading for dummies... I'd appreciate it...

    btw... it's a Automatic... from 1999... Z28...
    Mods: SLP Air Lid w/ KN, Free-Mods, LS6 Manifold, Magnaflow, Headers, EFILive
    Visuals: Angel eyes, rear eurolights and T/A rims
    Suspension: Eibach ProKit, UMI Adj. Panhard, SFC's, LCA Relocation brakets, KYB AGX shocks

    http://www.fquick.com/garages/Chevro...28/1999/23674/

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    NBM
    1998Z28

    Look on the drivers door at your build codes/

    GU2-2.73s
    GU4-3.23s
    GU6-3.42s

    How bout that?

  3. #3
    Puerto Rico LS1 Rikki_SeVeN's Avatar
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    gonna be hard to do... the last owner pretty much shredded the codes on the door...and how about the rest of the questions?

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    Puerto Rico LS1 Rikki_SeVeN's Avatar
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    it's kinda hard to tell but I think it says GU5...

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    GU4 is 3.08. Has to be either GU2 (2.73) or GU5 (3.23). See if it has an alum drive shaft, although it could've been changed. You can also check out a calculator like www.f-body.org/gears/

  6. #6
    Exalted Cyclops 67CamaroRSSS's Avatar
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    2002 Z28 A4 NBM
    Sadly now demodded :(

    Current 10-bolt in you car has a ring gear diameter of 7.5". Compare that to a 12-bolt which is 8.875" or a Ford rearend which will have a ring gear diameter of 8.8" or 9". As your car gets more powerful (drivetrain wise - and that includes suspension. i.e., control arms, torque arm, etc.) heavier duty items tend to take the punishment better. They don't call them "Severe or Heavy Duty" parts for nothing.
    Last edited by 67CamaroRSSS; 06-14-2007 at 03:07 PM. Reason: spelling errors

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    Puerto Rico LS1 Rikki_SeVeN's Avatar
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    it has Aluminum and it says GU5...

    so... how about the Aftermarket ones?...

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