Thread: HD Diff???

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  1. #1 Re: HD Diff??? 
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    yea i donno i dont think its different if it changed that would probably mean the ring gear is different and i know thats not different but i could be wrong
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  2. #2 Re: HD Diff??? 
    GrandPrix Junkie Sabrewings's Avatar
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    Quote Originally Posted by 05grndprix View Post
    yea i donno i dont think its different if it changed that would probably mean the ring gear is different and i know thats not different but i could be wrong
    Ring gear is the same in all 4T65Es, and there are three possible differential ratios from GM. Just because it didn't change doesn't mean the ratio didn't change. What does change the ratio is the size of the sun gear and likewise the size of the planetaries.

    May want to make sure before you go slapping it in.

    Quote Originally Posted by Scimmia View Post
    I believe all 3800 GPs used a 3.29 diff.
    Up to 03, I'm pretty sure that's the case. But 04+ I don't have any info on, so that's why I figured he should check it out.
    2004 Impala LS - got some mods sold!!!
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  3. #3 Re: HD Diff??? 
    GTP Level Member Scimmia's Avatar
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    Sun gear info:

    42 Teeth = 2.86 Ratio
    38 Teeth = 3.05 Ratio
    34 Teeth = 3.29 Ratio
    2001 Buick Regal LS - Almost Stock
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