Installing a Cadillac 4.9 in a 1985 Eldorado.
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HT4100 4.1, 4.5, 4.9 Discussion, Installing a Cadillac 4.9 in a 1985 Eldorado. in Cadillac Engine Technical Discussion; Hello all! I am new to this, so please bear with me. My current venture is to transplant a 1991 ...
  1. #1
    eaglebus40 is offline Cadillac Owners Member
    Automobile(s): 1984 Eldo Biarritz, 1985 Eldo Biarritz, 1992 Fleet De Elegan
    Join Date
    Aug 2014
    Posts
    2

    Installing a Cadillac 4.9 in a 1985 Eldorado.

    Hello all!
    I am new to this, so please bear with me.
    My current venture is to transplant a 1991 Fleetwood FWD 4.9 engine into a 1985 Eldorado Biarritz. That engine produced over 26 mpg in the Fleetwood.

    So far:
    1. The motor mounts from the 4100 bolt on to the 4.9.
    2. By modifying the AC compressor mount the compressor bolts right on.
    3. The exhaust manifolds will bolt right on, no modification needed.
    4. I have been in touch with a fabricator of torque converters, who believes
    they can make a converter that will bolt to the 4.9 ring gear, and the
    TH325-4L Transmission. I need to furnish them with adapter plate dimentions.
    5. My son and I are working on fabricating the engine to TH3225-4L adapter plate.
    If anyone has interist in this conversion, please let me know.
    I need to discuss the electronics with someone. I believe that with some
    modification all of the electronics will function normally!
    Thanks for your interist,
    Bill

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  3. #2
    eldoradodreamer is offline Cadillac Owners Member
    Automobile(s): none
    Join Date
    Jul 2013
    Age
    24
    Posts
    1

    Re: Installing a Cadillac 4.9 in a 1985 Eldorado.

    good luck very interesting i wonder if the the humpback seville is a good canidate

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    good luck very interesting i wonder if the the humpback seville is a good canidate check the wiring harness diagrams for both the transplanted engine and the old one if they dont match up switch em lookin for my own eldo but a 92 with the 4.9 love the allante intake but you lose power but it looks good.ranting again anyways good luck keep posts up.

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