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Vortec 6.0 Ideal Highway(60MPH) RPM

Discussion in 'Performance & Fuel' started by graknil, Dec 5, 2010.

  1. graknil

    graknil New Member

    I've done alot of research and decided the 2002-03 Vortec 6.0L will be the perfect swap motor for a project 4X4 I'm building(that's not a point for debate). But I can't find much/any information on typical stock highway RPM figures from the factory. I need the data to figure my axle gear ratios. It'll be an AX15 overdrive transmission on 35's in a 4,000lbs Jeep. If I used 4.11 gears my 60MPH RPM will be 1900. Seems like that is to high for the big V-8 for street manners and gas mileage. But 3.73s my next choice down (dictated by the reverse cut dana 44 front) leaves me at 1700 RPM. I think this is closer to the 6.0's highway comfort zone but I would like more input from the field.
  2. murdog94

    murdog94 New Member 1000 Posts

    1900 is about perfect... if you are doing 70 with an OD you are running about 2000-2100 with a stock truck.. so at 60 at 1900 you will be in the right range.. as long as you keep it under 2300-2400RPM it will still pull decent milage.

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