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Thread: Engine Swap

  1. #1

    Post Engine Swap

    I own a 98 chevy 1500 and I am thinking about doing an engine swap to a 04 or 05 GMC serria Vortec 350 which includes the motor, transmission, transfer case and computer. I am looking for and advice or info anyone can give me about this and what I can expect if I do this swap or if it is even possible. Also some advice on swaping out the drivers and passangers seat from an 04 or 05 serria to my 98 1500. any help or advice would be apprciated, thank you and have a good day.

  2. #2


    just wondering why u don't consider a Diesel swap to a 6.5 TD ? gives u better milage and more power..oh and is way cheaper !

    1996 Suburban K3500 SLT DUALLY
    1988 Camaro RS 383 stroker LT1
    1992 32' Aero-tek Race Boat, 600 CI BBC

  3. #3
    Jr. Engineer jwco5.3's Avatar
    Join Date
    Feb 2010
    Indianapolis, IN


    By 04 and 05 I dont believe they put 350's in the trucks anymore. Its either a 5.3 or 6.0. Anywho, anything is possible if you have the time and money.

  4. #4

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


    Like others said- it will be much easier to use a 96-99 5.7 vortec instead of the 5.3.
    The 5.7 would be a bolt in.

    It would be neat to see how a diesel would work.
    1998 suburban-
    1/2 ton

    199500 miles

  5. #5
    stephan's Avatar
    Join Date
    Sep 2010
    Far West, Oregon USA,
    Blog Entries


    Hey JL I think you're going to need the wiring harness as well as the ECM from the donor vehicle. There were a lot of wireing changes to the Vortec & you don't want to be adding one wire at a time to your harness to make it work. Like the others said it would be an easier swap to go with a diesel if you want to upgrade. As for your que about the seats, it's best just to check mounting points & see for yourself. Even though the mounting points might require minor modifications it should be doable.
    1988 Chevy C-3500 2wd (no pic)
    350 c.i. 5.7 L Stock Block, 4 Bolt Mains
    L-31 Vortec Heads, Edelbrock Cam & Intake,
    Holley 650, Flowtech Headers, Magnaflow exh.
    Jet Trans 700R4, B&M Ratchet, 4:10 gears,
    3" susp. lift kit "shadetree"
    No rev limiter, No speed limiter lol

  6. #6
    Master Mechanic daddytech's Avatar
    Join Date
    Mar 2008
    Portland TN


    unless you are doing an upgrade to power seats they should swap out easily but you may want to double check the mounting for them because i believe either the front or back outside mount is a little off from a 98 might have to do a little forcibile customizing to get it to shoe horn in there properly, as for the motor unless it is a 6.0 v8 I would just go back with another 5.7 from the 90's you won't be doing yourself any favors just because it's newer putting a 5.3 V8 in your truck. less power and a lot more headaches because as someone else pointed out some of the wiring on the harness is different than your 98. I've only had 5.7's since 1990 myself and i LOVE that motor, dependable as the day is long no matter how hard you work it. the transmissions however i believe are the same i think the 04/05 transmission is still the 4L60 transmission you may want to double check that before taking that leap too though.

    going from a 5.7 to a 5.3 you'll have mount trouble first off as they mount up differently but nothing an arc welder and a cutting torch can't fix right? it's all in how much time and money you have to do this swap though, if you just want something to drop in and bolt right up stick with a lower miles 5.7 if you have time and money to pour into it then knock yourself out with the 5.3 or 6.0 but remember what's been said about the wiring. you can also buy an after market harness that will bolt right up and not have to worry about going wire by wire double checking everything.

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