3.3 to 3.8 engine interchange



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Thread: 3.3 to 3.8 engine interchange

  1. #1
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    3.3 to 3.8 engine interchange

    Will a 1998 3.3flex fuel engine interchange with a 1998 3.8 engine ? I have a 98 grand with a 3.3 and a bad transmission and I can buy a 98 with a 3.8 and a rod knocking . I will have all the parts to change it over but is it worth it (both vans are complete). What will I have to change over is the question I guess , anyone out there done this??????

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    Yes it will work.
    What parts? , do you want to move over the flexifuel parts, is that your question ?.

    -96 Chrysler Grand Voyager T&C LXi 3.8l Up for sale
    -02 Chevrolet Trailblazer LTZ EXT

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    Can you use the 3.3 flex fuel parts on the 3.8 and still be able to use e85? I would think that the injectors might not have enough flow to meet the higher fuel demands of the 3.8. Not a big deal, just would have to know that you can no longer use e85.
    Candy the van. '98 Sport 3.8L 132,200 miles. Used trans at ~96k. Great piece of my life and a fine van.

    '69 GTO drop top
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    Quote Originally Posted by andyg View Post
    Can you use the 3.3 flex fuel parts on the 3.8 and still be able to use e85? I would think that the injectors might not have enough flow to meet the higher fuel demands of the 3.8. Not a big deal, just would have to know that you can no longer use e85.
    Andyg, you may wish to ask the dealer's parts manager about the differences in injectors. It may be "flow" it may also be design/material due to the E85. Best to check before assembling. Do you homework on this and you'll have a nice swap.

    Keep in mind exhaust size, too.
    1990 Plymouth Grand Voyager LE 3.3L LWB-- 207,000 miles and counting ......
    333,134.21 kilometers, for you metric buffs ......
    For Sale - Make Offer


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    Sounds interesting. Please keep us up to date. I'm sure there are some out there who have done this and many considering it. If you could take pictures of the process you would be a king on the forum. A KING I say!
    ******** We took the time to answer your post. Please give us some time and post the fix. You'll help hundreds. ********

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    96 Gr Caravan LE 3.8, 206K miles
    07 Fusion / 06 RAV 4 / 06 Accord / 94 Camry

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    What I mean is , what all will I have to change over to make it a dependable van again .
    I am planing on removing the 3.8 complete assembly, then taking the 3.3 out of my original van complete assembly and sticking it back in the hole . Hook up and fire up drive away happy

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    You will be just fine using the 3.8 trans on the 3.3 if that's what you intend to do.

    I was just wondering for goober's sake on the fuel parts. I am in no way planning on switching parts to e85 for my van. E85 is nowhere around my area, so having a FFV is useless to me.
    Candy the van. '98 Sport 3.8L 132,200 miles. Used trans at ~96k. Great piece of my life and a fine van.

    '69 GTO drop top
    www.facebook.com/people/Andy-Greif/1410438927

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    Quote Originally Posted by andyg View Post
    You will be just fine using the 3.8 trans on the 3.3 if that's what you intend to do.

    I was just wondering for goober's sake on the fuel parts. I am in no way planning on switching parts to e85 for my van. E85 is nowhere around my area, so having a FFV is useless to me.
    In that case, stick with the 3.8L FUEL SYSTEM and computer, remove the sticker from the fuel door. No changes anywhere else. You're good to go.
    1990 Plymouth Grand Voyager LE 3.3L LWB-- 207,000 miles and counting ......
    333,134.21 kilometers, for you metric buffs ......
    For Sale - Make Offer


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    It all depends on which van he wants to make a complete running assembly. Goober, to make your original van running, all that is needed is the trans swap. If you want to put the 3.3 into the new van, you will need to swap the computers along with it. You can leave the fuel system intact on the new van if you do not intend on using e85.
    Candy the van. '98 Sport 3.8L 132,200 miles. Used trans at ~96k. Great piece of my life and a fine van.

    '69 GTO drop top
    www.facebook.com/people/Andy-Greif/1410438927

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    Is the 3.3 and the 3.8 block the same , all the sensors cam ,crank, temp., oil sender and the like . I want to take the complete assembly out (the 3.3 runs great), replace the rear main seal , valve cover gaskets ,plugs,wires ,hoses and put it back in . It will still have the 3.3 flex injectors , I figure that the engine computer will have to be changed out with the 3.3 to keep it running the same engine (plug and play) and it will never know the difference still thinks it is running the original van .

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