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Thread: 3.73 Gears

  1. #1

    Default 3.73 Gears

    Hi Guys

    I have just enough mechanical knowledge to be dangerous, So a question>

    What does 3.73 gears mean, I know (or think I know) that that is the gearing in the rear end, but what does that mean to me. I assume it's some sort of compromise since the factiry installed it (them?)

    Thanks
    Gord

  2. #2

    Default

    Here is a link about 3.73 Gears,

    http://www.differentials.com/faq.html

    MIKE


    99"SILVERADO
    5.3 l 3.73 l G80
    BLACK BEAR CUSTOM TUNE
    SNUGTOP l COLORMATCH l KATZKIN










  3. #3
    Jr. Engineer moosetags's Avatar
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    Default Greetings from the Florida Panhandle

    You are correct, the 3.73 is the gearing ratio at the rear differential . Basically with a 3.73 rear end, the drive shaft turns 3.73 times to turn the drive axle one time.

    Differential ratio is, in fact, a trade off. The lower the number, the better the gas mileage. The higher the number, the better the torque and power. For instance the new 3.43 rear end in GM trucks gives better gas mileage, but does poorly in the heavy towing department. On the other hand, the 4.10 rear end offered in GM trucks, doesn't door as well in the mpg department, but is excellent and the one haht you want for heavy towing and hauling.
    Brian McCabe
    Santa Rosa Beach, Florida
    '05 Yukon XL 2500 Quadrasteer
    '11 Silverado 3500

  4. #4

    Default

    Quote Originally Posted by Restlessone View Post
    Hi Guys

    I have just enough mechanical knowledge to be dangerous, So a question>

    What does 3.73 gears mean, I know (or think I know) that that is the gearing in the rear end, but what does that mean to me. I assume it's some sort of compromise since the factiry installed it (them?)

    Thanks
    Gord
    Rear Axel Ratio, turns 3.73 times for one turn of the drive.

    If I'm not playin' ball I'm workin on my truck.... On a college budget... Yeah... Zip ties and duct tape FTW!

  5. #5
    Legend 2ToNe04's Avatar
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    Fresno California
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    Default

    Quote Originally Posted by David8790 View Post
    Rear Axel Ratio, turns 3.73 times for one turn of the drive.
    x2

    and i think all the 4.8 and 5.3 the only gears offered were, 3.73s and 3.42. I think the yukons and 6.0 models had 4.10s

    2004 4.8| Custom Paint| Tint| De-badged| Shaved Tailgate| Rollpan| Smoked Tails| Color Matched| Lowered 5/8| Suede Interior| Color Matched Interior| Indash & TVs| Mids-Lows & 2 12" CVRs| 500 & 1100 Interfires| Soundeadener| Outlaw CAI| Magnaflow|
    Future Mods: 6.0 LQ4/9| Bags|

  6. #6

    Default

    Quote Originally Posted by 2ToNe04 View Post
    x2

    and i think all the 4.8 and 5.3 the only gears offered were, 3.73s and 3.42. I think the yukons and 6.0 models had 4.10s
    and 3.23, my neighbors cc has that and the 4.8, so di i, but i have a manual

  7. #7

    Default

    3.23....yuck.
    2005 Chevy Silverado Z71 in Black

    6" BDS Suspension Lift | 3" BDS Body Lift |17" Rock Crawler Stellies | 35" Cooper STTs | 4.56 Yukon Gears | AirAid CAI and TBS | Flowmaster 40s | HyperPAC Programmer


    2001 TJ Sahara in Sienna

    3.5" RE Suspension Lift | 33x12.50 Baja MTZs | D30/44 | ROKMEN Merc Front Bumper | Warn Rockcrawler Rear w/ Carrier | Warn M8000 Winch



  8. #8
    Legend 2ToNe04's Avatar
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    Default

    Quote Originally Posted by masterfoxscout View Post
    3.23....yuck.
    i would smash my truck if it came with 3.23s

    jp

    2004 4.8| Custom Paint| Tint| De-badged| Shaved Tailgate| Rollpan| Smoked Tails| Color Matched| Lowered 5/8| Suede Interior| Color Matched Interior| Indash & TVs| Mids-Lows & 2 12" CVRs| 500 & 1100 Interfires| Soundeadener| Outlaw CAI| Magnaflow|
    Future Mods: 6.0 LQ4/9| Bags|

  9. #9

    Default

    My 4.8 has the 4.10, it was the only way I'd buy it. It will tow 8500# (according to the brochure).

  10. #10

    Default

    I have 3.08s in my Suburban from the factory...beat that. I will hopefully be swapping them out for 3.73s in the near to mid future.
    Christopher

    1991 Chevy Suburban 1/2 ton 2WD w/ chevy SBC 350-3/4 ton drivetrain upgrade w/4.10 gears 200K miles
    2005 Saturn ION-2 Stock 265K miles
    1982 Bronco, 1993 Bronco (sold), 1971 M35A2 Deuce and a Half



    There are 10 kinds of people, those who understand binary, and those who dont...

    Remember kids, the only difference between screwing around and science is writing it down- Adam Savage

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