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Thread: 4.7 to 4.0???

  1. #1
    Junior Member
    Join Date
    Jul 2011
    Posts
    3

    4.7 to 4.0???

    I'm trying to help a friend out, he blew his 4.7, we looked for a donor and he missed out on a good deal on a 4.7, but anyway, now he is thinking of swaping in the strait 6. What does it take? were looking for a complete vehicle.

    These are the parts i'm thinking he will need:

    I6 complete long block All accessories on motor.
    I6 motor wiring harnes
    I6 computer
    I6 exhaust down pipe and maybe a downstreem O2 sensor??
    I6 air box set up

    I'm unsure on the trans. will a trans from a 1999 4.7 mate to the I6?
    What else? any other harnesses to under the dash needed?
    what about cruze controll cables from the I6?
    What am i missing?

  2. #2
    Junior Member
    Join Date
    Jul 2011
    Posts
    3
    A 4.7 is mated to a 45/545RFE transmission while the I6 uses a 42RE. I would not expect the 4.7 transmission to mate to the I6. The 4.7 transmission has a separate transmission control module (TCM), but electric control of the 42RE is handled by the I6 PCM.

    Check the cooling system on the 4.7 to see if it has two radiator cooling fans, one being electrical. If it does, you will need to get the I6 fan or fans.

    This will be a more difficult job than you might imagine because of the amount of wiring that needs to be done correctly. A complete vehicle with the I6 is almost a necessity, and it should be a 99 (or possibly an 00) like the 4.7. You definitely will need a 99 FSM.

  3. #3
    Junior Member
    Join Date
    Jul 2011
    Posts
    5
    It would be substantially easier to simply obtain a 4.0 Jeep, and swap over any goodies or customization, than to swap the drivetrain. The 4.7 Jeep can then be parted out to help recoup costs.

  4. #4
    Junior Member
    Join Date
    Jul 2011
    Posts
    7
    I myself would never downgrade to a 4.0 if I had a 4.7. If I knew of a way to install a 4.7 in my ZJ, I'd do that if and when my 4.0 dies. Then, it'll be cheaper and easier just to stroke it when that day comes. I like my 4.0, but it's weak even with the ZJ, and it weighs less than WJ's. I'd definitely say get a 4.7 to replace it. But I don't know the ins and outs of actually doing an engine swap... It just seems like it'd be easier to do an exact swap instead of all this crazy stuff.


 

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