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Question About the GTO's A$$ end

This is a discussion on Question About the GTO's A$$ end within the GTO forums, part of the Vehicle Specific category; I would like to install a taller set of gears and don't know what to shop for. EX... 12" rear ...

  1. #1
    Junior Member SSG Duncan's Avatar
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    Yello
    2005 Pontiac GTO

    Question About the GTO's A$$ end

    I would like to install a taller set of gears and don't know what to shop for. EX... 12" rear end, 6 bolt? I have no idea. Also I hear a clunking sound from the rear. Nothing is loose. I had the same sound when I had my 00 B4C. Thanks for any help you can give me.

    First Tank!!!

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    Senior Member TLS_Addict's Avatar
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    That clunking could be from the ring and pinion have a large gap. My GTO did that if I would go from reverse to forward. It had a lot of play in it, most are known for it after a while.

    I think that the Lumina SS (same as GTO in middle east) came wit 3.07or something but not sure.

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    Member Texas Jack's Avatar
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    Cyclone Grey
    2006 GTO M6

    Stock gears in all Gtos are 3:46. Use the search or the net and you will find a lot of info. Good luck

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    Member JAX04's Avatar
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    PBM 366ci TC78 E85
    2004 Pontiac GTO PBM A4

    GFORCE engineering will be a good place for you look up. and the stock diff is kind of known for issues.

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    Smiles for 9.5 Years cammed goat's Avatar
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    Phantom Black Metallic
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    I would STILL love to find out how some of these GTOs in GMHTP with larger cubes or forced induction STILL run on the stock rear. IMPOSSIBLE!!!

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    Member derbs's Avatar
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    IBM
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    Quote Originally Posted by JAX04 View Post
    GFORCE engineering will be a good place for you look up. and the stock diff is kind of known for issues.

    You forgot the 1320 in the name.

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    Member Texas Jack's Avatar
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    Cyclone Grey
    2006 GTO M6

    Exotic Performace Plus has a moser M9 straight axle that will bolt in for 4k, Take a look, it is very cool!

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    Senior Member TLS_Addict's Avatar
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    Quote Originally Posted by cammed goat View Post
    I would STILL love to find out how some of these GTOs in GMHTP with larger cubes or forced induction STILL run on the stock rear. IMPOSSIBLE!!!
    No doubt! I saw some guys with FI running more highway gears but on the stock rear.

  9. #9
    Smiles for 9.5 Years cammed goat's Avatar
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    Quote Originally Posted by TLS_Addict View Post
    No doubt! I saw some guys with FI running more highway gears but on the stock rear.
    Yah. When I read the specs in the magazine, where it reads "REAREND" it would read "STOCK 3:46".

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    Member Texas Jack's Avatar
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    Cyclone Grey
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    Look at the GTO ET list and qwkgto ran a twin turbo set up 9.52 @ 144 1.55 60 ft on a stock rear!
    Last edited by Texas Jack; 11-04-2010 at 07:42 PM.

  11. #11
    cutting and welding mark21742's Avatar
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    hugger orange
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    408 stroker with built tranny and 3,800 stall here...89,542 miles, still running my stock rear

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    Junior Member SSG Duncan's Avatar
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    Yello
    2005 Pontiac GTO

    Quote Originally Posted by JAX04 View Post
    GFORCE engineering will be a good place for you look up. and the stock diff is kind of known for issues.
    Just what I was looking for thanks for all the help. Soo I wonder if a new ring and pinion would stop the clunk in the rear?

  13. #13
    Smiles for 9.5 Years cammed goat's Avatar
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    Check your U-joints in the driveshaft as well.

  14. #14
    Junior Member SSG Duncan's Avatar
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    Yello
    2005 Pontiac GTO

    Quote Originally Posted by cammed goat View Post
    Check your U-joints in the driveshaft as well.
    Hmm I would think to check that I would put the rear in the air. Car in gear with hand break on and check for slack in Drive shaft. Does that sound right.

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    Cosmos Purple
    2004 GTO

    I replaced my stock 3.46's with 3.91's after I ate half the teeth off the non shot peened 04 pinion gear. Bow my 3.91's are clunking while under light to moderate load. Heavy load or clutch pushed in the clunking goes away. Yay for "stock" rear ends
    2004 CPM M6
    TSP Torqer v2 112lsa, Landspeed Stage II 241's, K&N drop-in, Blevins Tune, muffler delete, more to come
    8.33 @ 84.93 1.87 60' BTA FTW!! (Prior to heads and cam)
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