3.73 vs 4.10 Gears

Discussion in 'Towing & Trailer Tech' started by Six point, May 11, 2014.

  1. Six point

    Six point Member

    I have a 2009 Silverado 2500 HD Crew cab 6.0 liter ,4 spd auto with 3.73 gears.I tow a 8000lb tow behind travel trailer with a UTV in the truck box. No inspections or emissions here in Alberta. I use Tow/Haul mode but problem is with 110 kilometer (68 mph) speed limits .I'm either screaming away at 3200 rpm or loosing ground and slowing down at 2000 rpm in high gear.Just getting tired being passed by loaded down Fords and Dodges tandem towing big Fifth wheels with a speed boat behind.Don't want to go the diesel route just yet.
  2. RayVoy

    RayVoy Epic Member 5+ Years 5000 Posts

    Hmmm, ok, your 4l80e has a 1:1 ratio for 3rd gear, and a 1 to .75 for 4th gear, when you downshift to 3rd, the revs go up 25% (2500 rpm).

    The 373 to 410 has about a 10% ratio difference. Using 4th gear, there will be a 10% increase in rpm going from 373 to 410 gears (2200 rpm).

    410 might be the way to go, if the 25% increase in rpm bothers you.
  3. Kvston2

    Kvston2 New Member

    Disagree entirely. I have driven and owned 2500HD chevy's with the 6.0 and there is a huge difference in felt and actual power under load. While I cannot vouch for the wisdom of using $1,500-2000 on diffs [with parts] to regear, it is a BIG difference in towing and hauling. I use mine to tow a 6K enclosed trailer and up until I got my cummins a 14K dump trailer.

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