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  1. #1

    Default Cummins swap into '96 z71

    Has anyone swapped a Cummins into a Chevy truck? Any info or links would be fantastic.
    Cummins, 4uck the rest! Leave the chevy's to the ni66ers.

  2. #2

    Join Date
    Jun 2006
    River Ridge Louisiana-4 miles W of New Orleans-didn't flood-water stopped 800 yards away.


    Wish I could offer some knowledge, but.

    I have heard that the earlier ones-maybe even the 12 valve ones-got better mpg than the current ones.

    I guy who tows claims he gets 21 mpg unloaded- but with trailer- in his 1997 MT 3/4 ton Dodge 2wd.Pretty good mpg.

    I think the 2004's and earlier- 4 valve- are supposed to get better mpg than the more recent ones also.

    1998 suburban-
    1/2 ton

    199500 miles

  3. #3


    recent cummins are powerful but not nearly as bulletproof or economical to run as the older cummins. With the horsepower race and new emissions laws came a loss in MPG and reliabiliy in the diesel truck world. I'm pretty sure of all the medium duty diesel trucks, the cummins gets the worst mpg.

    But who am I kidding, I would LOVE a cummins in my Z71.

  4. #4
    Legend tlperry68's Avatar
    Join Date
    Oct 2008
    Huntington Beach, CA


    I haven't seen it but that Cummins is a good motor.
    Trevor - Huntington Beach, CA
    2007 GMC 2500 4X4

  5. #5

    Default The reason I ask.

    This got 20.8 mpg from Omaha NE to Sioux City to Clear Lake Iowa to Des Moines Iowa to Shenandoah Iowa, last week end. Today from Malvern Iowa to Shenandoah Iowa, I got 27.8 mpg( all flat south bound). But it's still no Chevy....yet. I prefer my '96 z-71, but it only gets 14 mpg and 4 mpg with 10k trailer hooked! This gets 14-17 with the trailer, and will pull 80 mph uphill.
    Last edited by highmilageklr; 02-26-2009 at 10:38 PM.

  6. #6


    I had 2 Cummins trucks. My 24 valve actually did better than the 12v the way it was set up (best of 24 mpg hand calculated across Ohio).

    The engine is VERY heavy too, something to consider.

    I have seen 2 Chevy 1/2 tons and Jeep with 4BT Cummins engines, something to consider over a 6BT or 24 valve engine.

    I'd go '98 12 valve and older in the 6BT or do the 4BT for simplicity. Would help to stay away from the computer controlled 24valve engines.

    2005 Silverado Crew Cab 5.3l 4WD

  7. #7


    You would have to do some serious beefing of the frontend to carry the Cummins. Either a full swap from a K3500, or a Dana 60 SAS. I don't know about economy, but the Duramax has plenty of power, with more on tap.
    When you hear hoofbeats, look for horses not zebras.

  8. #8

    Cool Cummins swap into 96 Z-71

    Check out or phone them at 303-945-7570. They have Cummins conversions kit for Gms, Fords and Dodges.

  9. #9

    Default swap

    I have seen a cummins swap into a mid 80's truck, but it was basic;y started from scratch. It turned out very well

  10. #10
    Sr. Apprentice hmaster77's Avatar
    Join Date
    Jun 2009
    Kingsville/San Marcos TX


    i would definitly go with a 12 valve bc they last forever i have helped swap out a 12 from dodge to another dodge and it wasnt to hard but it will b different to a z71
    2008 chevy silverado single cab short bed 4.3
    1960 chevy apache 10 single cab short bed 3.9
    1986 chevy 1 ton flatbed 5.7 (deceased)
    1990 suburban regency edition 5.7 (sold

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