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3.73 Gears

This is a discussion on 3.73 Gears within the Drivetrain forums, part of the LSx Technical Help Section category; How much of a difference will I see & feel with 3.73 compaired to stock?...

  1. #1
    Junior Member 98 Z/28's Avatar
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    3.73 Gears

    How much of a difference will I see & feel with 3.73 compaired to stock?

  2. #2
    Member Mr. Hyde's Avatar
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    Do you have an A4 or M6?

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    Junior Member mph1972's Avatar
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    If you have an A4, do you have the 2:73 and 3:23 setup?

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    Exalted Cyclops 67CamaroRSSS's Avatar
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    You go from 2.73 to 3.73 you'll see a big difference.

    FYI: If you're stock then steel driveshaft = 2.73's; aluminum = 3.23's. Or look at the door sticker option list: GU2 = 2.73's & GU4 = 3.23's.

    If you have 2.73's you'll need a 3 series posi.

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    down with the lot lizards blackhawk01's Avatar
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    what about going from 3.42's to 3.73's...

    sorry to whore your thread man

  6. #6
    2 SS's are better than 1 Jays00ss's Avatar
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    Quote Originally Posted by blackhawk01 View Post
    what about going from 3.42's to 3.73's...

    sorry to whore your thread man
    6 speed don't waste your money, auto it would be worth it.

  7. #7
    386HP 373TQ jwindbigler's Avatar
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    With the 6speed, I would go with 4.10's at least. I made the mistake of going from 3.42's to 3.73's and felt a little more pull, but not much.

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    Senior Member GULLETT17's Avatar
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    00 TA PWTR, 98 VertTA NBM
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    Quote Originally Posted by 67CamaroRSSS View Post
    FYI: If you're stock then steel driveshaft = 2.73's; aluminum = 3.23's. Or look at the door sticker option list: GU2 = 2.73's & GU4 = 3.23's.
    This really true!?. . i've been wondering what gears my ta had because it doesn't have the sticker anymore. and hadn't got around to taken the cover off yet.
    good to know i have 3.23's!

    I think you will notice a difference between 3.73's and stock. IMO, 3.73's or close to is about the perfect running gear for a dd or summer A4 fbody. 4.10's are bad ass though.
    Last edited by GULLETT17; 01-09-2008 at 05:22 AM. Reason: misspell
    2000 TA, A4, LS6 intake, Magnaflow, WS9 hood, BMR STB, UMI boxed SFC, Spohn LCA, 9" Ford
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    Junior Member 98 Z/28's Avatar
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    A4 3.23's

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    Junior Member 98 Z/28's Avatar
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    The only code I see on the door says GU5 is this correct? I can't find any other code on the door that says GU4 or GU2.

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    Senior Member Zboner's Avatar
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    yea its GU5 is the code for the 3.23's GU6 is the code for the 3.42's in the 6 speed cars.

  12. #12
    Junior Member 98 Z/28's Avatar
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    So it's GU5 not GU4

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    GU2 Axle, Rear 2.73 Ratio
    GU4 Axle, Rear 3.08 Ratio
    GU5 Axle, Rear 3.23 Ratio
    GU6 Axle, Rear 3.42 Ratio
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  14. #14
    Senior Member clg82's Avatar
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    Quote Originally Posted by 67CamaroRSSS View Post
    You go from 2.73 to 3.73 you'll see a big difference.

    FYI: If you're stock then steel driveshaft = 2.73's; aluminum = 3.23's. Or look at the door sticker option list: GU2 = 2.73's & GU4 = 3.23's.

    If you have 2.73's you'll need a 3 series posi.
    I didn't know that the 3.23 came with an aluminum drive shaft!!! What does this do as far as performance goes?
    2000 Arctic White trans am, ws6 hood, ws6 air box, slp lid, slp smooth bellows, slp loudmouth exhaust,shift kit, rebuilt trans, LS6 intake, 3.73 gears, Shaner S3 p/p throttle body, and a tune . SFC. C6 ZO6 rims 18" in back 17" in front. Drilled and slotted rotors.

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    I just look at my door tag, Gu5. So I have 3.23. How big of difference would be going from 3.23 to 3.73 or even 4.10s. Would it be to harsh to dd.

    Matt

  16. #16
    Senior Member clg82's Avatar
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    Quote Originally Posted by MATTREDSS View Post
    I just look at my door tag, Gu5. So I have 3.23. How big of difference would be going from 3.23 to 3.73 or even 4.10s. Would it be to harsh to dd.

    Matt
    When upgrading your gears, 4:10 is more common for manuals and 3.73 is more common for automatics. especially if it is your daily driver!

  17. #17
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    ^^^
    OK cool,thanks. Since I have auto I'll go with 3:73s.Is it a big noticeable difference going from 3:23 to 3:73.

    Matt
    Last edited by MATTREDSS; 01-10-2008 at 06:13 PM.

  18. #18
    Senior Member clg82's Avatar
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    Quote Originally Posted by MATTREDSS View Post
    ^^^
    OK cool,thanks. Since I have auto I'll go with 3:73s.Is it a big noticeable difference going from 3:23 to 3:73.

    Matt
    I have them waiting in my closet to be installed. I have heard that the difference is like night and day. I will find out once I receive my tax return back! And remember you will have to get your spedo recalibrated as well to compensate!!!

  19. #19
    Senior Member slims00ls1z28's Avatar
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    2 big reasons most autos go 3.73's is either they are scared they will suffer gas mileage wise, which with just that is minimal at best and almost no noticable difference from a 3.73 and that in the 1/4 with stock rev limiters you might have to shift into OD crossing the traps. I have 4.11's and haven't noticed a huge decrease in gas mileage over the stock 2.73's. And i did mostly highway. went from like 10$ a day to like 13$ for the same drive and given that is spread out on a 100 mile trip that is still better than 20 mpg and that is with my cam (MS3)and stall (3600). Huge difference with gears alone, much more fun. I say get the 4.10's even if you're an auto. That's a 6 speeds biggest advantage I think anyway is the gearing.

  20. #20
    A trained professional volleybill's Avatar
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    I ran 4.10's on a LT1 Caprice, and would do it again in a second! With the overdrive transmission, not too bad on the street as long as you aren't cruising for hours at 90 MPH- the feeling leaving every light and stop sign is just mind-bending! Wheelspin whenever you want, just mash the gas.

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