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373 gears good?

This is a discussion on 373 gears good? within the Drivetrain forums, part of the LSx Technical Help Section category; Would 3.73 gears be good for my A4 trans am? I already have the A4 performance axle with the 3.23 ...

  1. #1
    Senior Member clg82's Avatar
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    2000 Trans Am

    373 gears good?

    Would 3.73 gears be good for my A4 trans am? I already have the A4 performance axle with the 3.23 . (door code GU5) Would it be worth me getting the 3.73 since i already have the 3.23? What gains will I see and will I "feel" a difference?
    Last edited by clg82; 07-17-2007 at 11:09 PM.
    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.

  2. #2
    UberTapping Friction Pimp Anthracis's Avatar
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    You'll feel a slight difference. But I would swap out the whole rear for a ford 9".
    "I am the executioner. When a crime is committed and the exalted state does not take vengeance nor move to punish, then comes time for the executioner to declare himself. I have waited long enough. The criminals are hereby sentenced to death. By fire. By earth. By water."

  3. #3
    Senior Member mrr23's Avatar
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    yes. i have the 3.73 gears in my car. i swapped from a 3.23.

  4. #4
    Member silverz28camaro's Avatar
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    sebring silver
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    i went from the 10 bolt 2.73 gear to a 12 bolt moser 3.73 gear

    2.73 2.002 60 8.4 1/8 23.30mpg highway 70mph
    3.73 1.88 60 8.1 1/8 20.78mpg highway 65mph

    if you are worried about mph, go 65 your car will get better gas mileage, numbers don't lie

  5. #5
    2 SS's are better than 1 Jays00ss's Avatar
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    Quote Originally Posted by Anthracis View Post
    You'll feel a slight difference. But I would swap out the whole rear for a ford 9".
    I second this, Save your money and get a 9" or 12 bolt (preferably a 9") for the $500 (gears, rebuild kit, oil, gasket, labor) you will spend on the gear swap, you'll be 1/4 of the way to a new and 10X better rearend. I wish I would have done this.
    I am now saving for the 9".
    2000 SS Camaro Heads, Large cam, Fast 90, 9"w/430's and locker, yada yada yada... you get the picture

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  6. #6
    Senior Member Too Fast's Avatar
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    Quote Originally Posted by silverz28camaro View Post
    i went from the 10 bolt 2.73 gear to a 12 bolt moser 3.73 gear

    2.73 2.002 60 8.4 1/8 23.30mpg highway 70mph
    3.73 1.88 60 8.1 1/8 20.78mpg highway 65mph

    if you are worried about mph, go 65 your car will get better gas mileage, numbers don't lie
    Your gas MPG seem awful low. My '98 with 2.73 would get over 27 MPG, but the car had only a lid. You must have a cam or more? With our '00 6 spd, I checked my 12.99 1/4 run, it showed an 8.44 1/8th. I got 27.6 and 28.4 MPG @ 75 or so MPH with AC on when needed this past May, all I have is headers and a lid.
    I always wanted to swap some 3.73s in my '98, I think that would be a great gear. Unlike others, both my Trans Ams have never had any rear diff problems. I am glad GM spent the $$$ on the engine rather than the differential.

  7. #7
    Double Tap Heartbreak1's Avatar
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    Quit your bitchin. lol
    I have the 3.23 rear and im barely getting 19 mpg city.

  8. #8
    Junior Member TwiSSter418's Avatar
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    I went from 3.23 to 3.73 and really didn't feel much of a difference. Maybe I was expecting too much, but I wasn't impressed with the improvement.

  9. #9
    Senior Member camarojunky74's Avatar
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    with 373's you can expect a 8.10 1/8 mile time rather than an average stock 8.90

    i think this a huge improvment,
    quarter mile times wont be as derrastic of an imrpovment.

  10. #10
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    Get a converter

  11. #11
    Senior Member slims00ls1z28's Avatar
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    2005 GTO M6 Black
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    9"- 4.10-3500 Stall It will feel like a whole different car. Can't say gas mileage is all that hot but it's still better than my brothers stock 16 mpg SUV so I won't complain especially highway. Combined so far even with stall gear cam untuned and all mods I still manage roughly 20-22 mpg depending on how much I play. I can watch the hand drop if I mash it though.
    My Toy 00 Z28 1SC A4 - MS3 cam with supporting valvetrain, Milled LS6 heads, LS7 lifters, , ARP rod and mains, All free mods, pacesetters, True duals, moser 9 with 4.11's and Detroit Locker, Vig 3600 tuned, tubular SFC,adj PHR, LCA, adj TA, PHR reloc, LCA reloc. all with poly bushings, ZR1's and Nitto DR's (315).

    My other toy 05 GTO LS2 M6- Comp XR269HR cam, 918's, hardened pushrods, Dart Pro 1's, pacesetters, X-pipe, flowmaster 1 chambers, TSP oil pump, Tick master cylinder. Pedders RR bushings, end links, SB bushings, tie rods and strut mounts, total performance poly F&R bushings. Polk DVC 12", Infinity Kappa 6.5 component and 6x9's with corresponding amps.

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  12. #12
    98T/Aformula
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    Quote Originally Posted by TwiSSter418 View Post
    I went from 3.23 to 3.73 and really didn't feel much of a difference. Maybe I was expecting too much, but I wasn't impressed with the improvement.
    X2, I am going back to the stock 3.23s and just putting in a stall....All my top end went away and low end did not change much....

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