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weird noise when shifting down

This is a discussion on weird noise when shifting down within the Automatic Transmission forums, part of the Drivetrain category; when i manually downshift the car into first at lets say 30 mph or so it makes a harsh noise ...

  1. #1
    Junior Member Fox Body's Avatar
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    weird noise when shifting down

    when i manually downshift the car into first at lets say 30 mph or so it makes a harsh noise when it shifts down.....kind of a clank/grind.....the previous owner said it has done that since the transmission was rebuilt about 15000 miles ago and that it has done that ever since....he said it was just that the linkage need to be adjusted....what do you guys think

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    Junior Member Fox Body's Avatar
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    wow this forum is a lil slow

  3. #3
    Member fieropope's Avatar
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    01 formula

    my guess is the rear planetary pinions are wearing and when under stress they are un meshing from the other gears , my car did this not when i was manually down shifting but whn i would punch it in second ,and make it downshift , take it easy on the car and it might last or thrash on it like i did (full warranty ) an get a new one.

  4. #4
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    black
    02 vette vert

    when i hold the rpms at about 2500-3500 and drop it into drive mine makes a noise too.

  5. #5
    Member fieropope's Avatar
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    umm i dont even wanna start on how bad that is for your trans dude.lol just have to ask why would you do that??!! our cars make enough power to burn the tires,thats the only reason i could think of why you would do that

  6. #6
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    actually that was a joke, cuz im wondering why you would pull an automatic transmission into 1st gear manually at 30mph or so. sick humor but it worked.

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    oops i forgot

  8. #8
    Member fieropope's Avatar
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    white
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    i was hoping that was a joke but you just never know .lol yeah 30 is a lil high to put it in first, id go with 2nd myself but hey whatever ya need right .

  9. #9
    Junior Member Fox Body's Avatar
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    well even if you were to do it at 20 it still does it......

  10. #10
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    Quote Originally Posted by Fox Body View Post
    well even if you were to do it at 20 it still does it......
    maybe you just shouldnt do it. i told the doctor my arm hurts when i do this, he said then dont do that.

  11. #11
    Member fieropope's Avatar
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    i would definitly say its the planetary ..which suuuucks there is no bandaid for that. time for a rebuild

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  13. #13
    Senior Member JaycenK's Avatar
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    Yea You really shoudn't pull these auto's into first because of the high first gear ratio. It's kinda like tring to do a hard braking down shift into first on a manual, It is never going to sound nice, not to mention the wheel hop you must get. If your talking about a 4l60E, These trans are computer controled so a linkage adjustment wont do anything. The manual valve is in the right spot in the valve body otherwise it wouldn't go into first gear. The only thing that shifter controls is rerought fluid, the computer has to active or deactivate the solinoids. The solinoids change the true flow of the fluid for different gear choices.
    Last edited by JaycenK; 05-22-2009 at 12:40 PM.

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