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Thread: 1991 chevy 4.8 swap

  1. #1
    Join Date
    Apr 2008
    Posts
    2

    1991 chevy 4.8 swap

    I am looking into starting a new project with my truck. I picked up a 2002 4.8l for almost nothing, my idea was to swap that into my 1991 c1500 rcsb truck. I currently have a 4.3l v6 in it right now with a rebuilt 700r4 with less then 8k miles on it. My question was what would be needed to put this in my truck?
    I am assuming that I will have to have a y pipe custom made and motor mounts adjusted. I herd somewhere that if I use a 1998 corvette flywheel the torque converter would mount up. But what about the tv cable and will a 0411 pcm run the lockup in my trans? How would i wire up my gauges and will the current fuel lines take the added pressure of a newer pump? Are there any specific computers I should look for and stay away from? What would be easiest to tune? I almost done even know where to start with one of these motors!

    I have a little experience in this field, my last swap was in a 1984 s-10 blazer 4x4. I put a brand new gm 3.1 camaro crate engine in it and ran a 1227727 computer. So I should have no problem with wiring and tuning the pcm.

    Any help would be greatly appreciated.

    Matthew

  2. #2
    Join Date
    Aug 2004
    Posts
    6
    on the engine mounts, you'll need to either buy or fab some adapter plates to mount to the block.

    not sure about the tranny. personally, i'd just get an 02 tranny and then the wiring for the whole assembly is a snap to the gauges. when i first installed my 6.0 w 4l80e to the stock dash it only took like 6-8 wires to run the setup. i would also get an older throttle body to get rid of the drive by wire then you'll have to also get new throttle cable and cruise cable.

    if the fuel system is the same as that used for a 5.7 then all you'd need to do is swap the fuel pump and tie the fuel lines into the fuel rail.

    good luck!

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