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what rear end

Discussion in 'Chevy Trucks' started by NCat496, Oct 28, 2009.

  1. NCat496

    NCat496 Senior Member
    Messages: 353

    What rear end should i want in a new 3500HD diesel/allison, the 3.73 or the 4.10 and why?
  2. RichG53

    RichG53 PlowSite.com Addict
    Messages: 1,135

    A nice looking Blond........:laughing:... What color trk ?????
    Last edited: Oct 28, 2009
  3. NCat496

    NCat496 Senior Member
    Messages: 353

    blonde doesnt cut it, she has to have a few more extras :D
  4. JaimeG

    JaimeG Senior Member
    Messages: 448

    I'm not sure, but I think the 4.10 is meant for trucks that do a lot of heavy towing. And the 3.73 is more for highway cruising, not sure, correct me if I'm wrong.

    JRKRACE Senior Member
    Messages: 172

    I could be wrong, but I think that 3.73's are your only choice.
  6. 2COR517

    2COR517 PlowSite Fanatic
    Messages: 7,115

    Pretty sure you want the 3.73s with the Dmax
  7. NCat496

    NCat496 Senior Member
    Messages: 353

    the internet option when i built it gave me both options, the internet is not always correct though so thats why im just checking
  8. aeronutt

    aeronutt Senior Member
    Messages: 262

    Since the introduction of D-Max in 2000, the only ratio the factory offered is 3.73 with diesels. If you can get it with 4.10s this year, it's the first time they've done it. I wouldn't want 4.10 on mine. The Allison's gears are perfectly matched to the torque curve of the D-Max and the 3.73 axle.
  9. 2COR517

    2COR517 PlowSite Fanatic
    Messages: 7,115

    3.73s are stronger than 4.10s anyway.
  10. Q101ATFD

    Q101ATFD Senior Member
    Messages: 277

    The only factory option rear differential available with the Duramax/Allison is the 3.73.

    How so? The same 14 bolt axle, with 4.10 gears was an option with the 8.1L/Allison combination before that was canned in 2007.5+ models.
  11. 2COR517

    2COR517 PlowSite Fanatic
    Messages: 7,115

    Larger Pinion gear.
  12. got-h2o

    got-h2o 2000 Club Member
    Messages: 2,439

    X2.............and to add, the reverse gear is so deep I couldn't imagine it with 4:10's. I run 35's on my trucks and the stock gearing is still good. I considered putting 4:10's in my service truck b/c its often loaded or pulling a trailer, but again only b/c of the 35" tires. It still does fine just how it is though.
  13. NCat496

    NCat496 Senior Member
    Messages: 353

    thanks guys, i obviously only have a choice with 3.73's. My 8.1/Allison has 3.73's and reverse in so low geared it almost needs a second gear but its great for backing trailers up hills fully loaded.