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  1. #1
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    1965 Coronet 4 speed lubrication confusion

    When I first purchased my Coronet, the shop that I used to flush and replace all fluids put Dextron 3 into the gearbox saying that was the required lubricant after research. I am planning on taking the car on a fairly long trip soon and am uptight that it doesn't have 90w gear oil. Should I be? Thank you!

  2. #2
    Senior Member 65rbdodge's Avatar
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    Yes you should be uptight. It should have GL4 gear oil in it. Plan on ordering it online I wasn’t never able to find it locally.
    There ainít no peace in the barnyard since the little red roosters been gone

  3. #3
    Senior Member markz's Avatar
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    The shop was right. Automatic tranny fluid is correct – see the pic below from the 65 factory service manual.

    Growing up, we had a 65 Belvedere 6 cyl 3 speed on the column. My dad put gear oil in it and couldn’t shift it. Had to put ATF in it.

    tranny lube.jpg
    67 Coronet 500 - 9.610 @ 139.20 mph
    Owned Since 1981

    Daughter's Car
    67 Coronet 500 Street Car with AC
    13.300 @ 101.75 mph

    69 GTX clone - build in progress........

  4. #4
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    Thank you!

  5. #5
    I was the first... 67r/t4speeder's Avatar
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    I always believed that was for racing or very cold weather. Atf
    The Idaho Andy

  6. #6
    Senior Member markz's Avatar
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    Quote Originally Posted by 67r/t4speeder View Post
    I always believed that was for racing or very cold weather. Atf
    I always found it to be a confusing topic. For 69, they show either ATF or multipurpose gear oil - see below. I talked to Jamie Passon and he said to use ATF.

    tranny lube 69.jpg
    67 Coronet 500 - 9.610 @ 139.20 mph
    Owned Since 1981

    Daughter's Car
    67 Coronet 500 Street Car with AC
    13.300 @ 101.75 mph

    69 GTX clone - build in progress........

  7. #7
    I was the first... 67r/t4speeder's Avatar
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    Who has tried atf? , curious how it reacted myself.
    The Idaho Andy

  8. #8
    Senior Member 65rbdodge's Avatar
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    Quote Originally Posted by 67r/t4speeder View Post
    Who has tried atf? , curious how it reacted myself.

    I tried it once, it kept trying to shift by itself. That just took all the fun out of it for me. HAHA!!
    There ainít no peace in the barnyard since the little red roosters been gone

  9. #9
    Junior Member MarkMopar's Avatar
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    ATF in an 833 4-speed will eat the countershaft. Always go with gear oil.

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