3.73 Gears

Discussion in 'GM Powertrain' started by Restlessone, Aug 29, 2009.

  1. Restlessone

    Restlessone Member

    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?)


    99'HEARTBEAT MODERATOR Staff Member 5+ Years ROTM Winner 1000 Posts Platinum Contributor

  3. moosetags

    moosetags Rockstar 100 Posts

    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.
  4. David8790

    David8790 Member

    Rear Axel Ratio, turns 3.73 times for one turn of the drive.
  5. 2ToNe04

    2ToNe04 Epic Member 5+ Years 1000 Posts


    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
  6. 5speedsilverado

    5speedsilverado Epic Member 5+ Years 1000 Posts

    and 3.23, my neighbors cc has that and the 4.8, so di i, but i have a manual
  7. masterfoxscout

    masterfoxscout Rockstar ROTM Winner 100 Posts

  8. 2ToNe04

    2ToNe04 Epic Member 5+ Years 1000 Posts

    i would smash my truck if it came with 3.23s :)

  9. Dale Lake

    Dale Lake New Member

    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. Crawdaddy

    Crawdaddy All hail the Mad King!! Staff Member 5+ Years 1000 Posts Platinum Contributor

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

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