Duramax Diesel RPM's?

Discussion in 'Trucks and Trailers' started by mjealey, Feb 20, 2009.

  1. mjealey

    mjealey LawnSite Senior Member
    Posts: 475

    Hey guys, I was just wondering something. When you guys are cruising down the highway at 65, what rpm's are you turning? With no trailer and mostly flat highway.
     
  2. JPsDuramax

    JPsDuramax LawnSite Senior Member
    from Georgia
    Posts: 346

    Just shy of 2000 RPMs
     
  3. TLS

    TLS LawnSite Fanatic
    Posts: 7,940

    It depends on the transmission (5A, 6A or 6M), axle ratio, and tire size.
     
  4. 02DURAMAX

    02DURAMAX LawnSite Gold Member
    Posts: 3,805

    All Duramax trucks are 3.73's

    and at 1920RPM on my duramax.
     
  5. TLS

    TLS LawnSite Fanatic
    Posts: 7,940

    What about the 4.88, and 5.13's???
     
  6. mjealey

    mjealey LawnSite Senior Member
    Posts: 475

    Allright, I was just checking. Mine runs right at 2,000. Obviously, 3.73 gears and 265 tires. Thanks guys.
     
  7. GravelyNut

    GravelyNut LawnSite Bronze Member
    Posts: 1,594

    Weren't the 4.10s available in 2001 also?
     
  8. GravelyNut

    GravelyNut LawnSite Bronze Member
    Posts: 1,594

    If you have stock tires and the 4.10s you'll turn ~2100 RPM at 65 MPH.
     
  9. mjealey

    mjealey LawnSite Senior Member
    Posts: 475

    I have always been told that all Duramaxes come with 3.73 gears from the factory and there is not another option. Is this true or could you special order 4.10's?
     
  10. TXNSLighting

    TXNSLighting LawnSite Fanatic
    from DFW, TX
    Posts: 6,462

    mine sits at 1700 at 70mph. when im at 80 im runnin 1900ish. so id guess around 1650 at 65. (i never drive that slow) I have 3.73's as well, and was told its super hard to find anything else in the dmax.
     

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