Decision time, who can help?

Discussion in 'Chevy Silverado Forum (GMC Sierra)' started by Necred, Oct 11, 2013.

  1. Necred

    Necred Member

    I have a 00 Z71 5.3, when occasional towing, I have bad sagging & even with 5-6k load I can feel it., It keeps my speeds low. I have came across a xclean one owner 03 2500 6.0 95k (3.7 or 4.1rear) I am considering buying & selling my 00. I read about "reduce engine power" problems & mpg issues. What are the pros & cons of either truck, thanx
  2. workman482

    workman482 New Member

    I have a 2003 2500HD 4x4 with the 6.0, manual tranny, and 4.10 gears. It pulls like a mule. I have no problems with pulling or loss of power. The worst MPG I've had was 10.8 and the best was 11.6 so you do take a hit in the fuel economy dept. That is due to no active fuel management.
  3. j cat

    j cat Epic Member 5+ Years 1000 Posts

    I would check the fuel pressures. 53 psi min engine running. next would be a restricted exhaust.

    I tow my 4300 lb boat with no problems 2000 sil LT 4WD 5.3L
  4. Necred

    Necred Member

    Well, I bought the 03 2500, it has 90k miles,,....I will check 00 psi & exhaust,, it has 153k miles, it was also one owner never been in 4wd so it hasn't been abused...I can tell by the power this 03 is gonna burn much more than 5.3....i will keep them both for couple months see which one id rather drive, neither would be a daily driver.
  5. j cat

    j cat Epic Member 5+ Years 1000 Posts

    the 2500 will require 3 or more MPG. with the 2000 SIL 1500 I get 18-19 MPG . more in the warm weather . I have 145K now on it .
  6. Necred

    Necred Member

    Would it be worth it to find someone to swap my 4.1 gears with 3.7, not just for gas, but I believe it will be a more comfortable cruise at lower rpms. and still pull 6k which is my limit on occasions ..? My 00 Is pretty much loaded but this 03 has couple other amenities I could enjoy... such as Steering wheel radio control & lumbar. Is it possible or beneficial to deactivate the AFM?
    Last edited: Oct 13, 2013

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