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Thread: 4D55T Alternator

  1. #1

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    08-30-2023
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    Minneapolis, MN
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    1988 Dodge Power Ram 50
    Engine

    4D55-T

    4D55T Alternator

    Y'all must have replaced and rebuilt these. What are my options for a cheap replacement while I find someone to rebuild the stock one? I don't mind having a backup.

  2. #2



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    Sacramento, CA
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    1979 Dodge D-50
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    O’Reilly auto parts. Theres not much of a choice out there for larger ones
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  3. #3

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    1986 Mitsubishi Mighty Max
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    You could always opt for the conversion shown here.

  4. #4

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    1980 Mitsubishi L200
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    Any of the astron alternators will fit

  5. #5




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    Pittsburgh, PA
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    1980 Dodge D-50
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    G54B
    BUt the diesel alternator has the vacuum pump built into the back of the alternator. To use a regular alternator, you need to install an electric vacuum pump to supply vacuum for the brake booster.
    Pennyman1
    The best Dodge that Dodge never made
    Living the D-50 lifestyle since 1980

  6. #6

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    North Dakota
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    1986 Mitsubishi Mighty Max
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    I did not know about the vac pump.

    Not that this pertains to the OP's requirement for "cheap", I wonder how well an electric booster from a Honda would fit in there. Then one would not need the pump and could go with a big boy alternator to power their 31" subs. I live in a low-population state, so finding parts like that for experimenting is no bueno for the most part.

  7. #7

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    Good catch Pennyman, foolish oversight by me.

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