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Thread: Hard downshifts

  1. #1
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    Default Hard downshifts

    Hey guys my 02 Concorde 3.5l downshift really hard from 2-1 gears. Anyone have this problem? Its got 196k and due for a timing belt, but i dont want to change it if the trand is smoked

  2. #2
    300Mguy 300M guy's Avatar
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    My 99 300M does the same thing. Extremely hard downshifts, and hard or sloppy upshifts at certain times. What does the fluid look like, and what is the level? You might want to try reseting the transmission control unit by disconnecting the battery for a few minutes. My battery was completely dead for a while because I don't drive it much anymore, and the downshift feels a bit different now. It still has the same sloppy upshift unfortunately.

    I know this is a different vehicle, but I reset the TCM in a 2010 Jeep Liberty that was shifting poorly, and it made a huge difference. The LH car's 42LE transmission is actually very closely related to the 42RLE in the Liberty. Resetting It might help, but then again it could also do nothing if the transmission fluid is bad, or if the transmission has a serious problem.

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    1999 Chrysler 300M, 3.5l HO, 42LE
    2000 Ford Expedition Eddie Bauer 4x4, 5.4l, 4R100

  3. #3
    Mopar or No Car D76G12's Avatar
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    Quote Originally Posted by Dodgeit View Post
    Hey guys my 02 Concorde 3.5l downshift really hard from 2-1 gears. Anyone have this problem? Its got 196k and due for a timing belt, but i dont want to change it if the trand is smoked
    If your tranny fluid isn't burnt then it should be fine. 2-1 downshifts aren't a problem but if the 1-2 upshift starts to slip that *could* indicate a problem, though not necessarily. If the tranny's going bad you can usually smell it in the tranny fluid.


    Yes, resetting the PCM is a good idea in general, especially if it's being driven differently (change of drivers, for example) or driven in a new climate. That doesn't reset the tranny fluid volume adjustments that occur over time from normal wear (and you don't really want to do that unless you're having tranny work done) but it can change the shift pattern a little and could have a small to moderate influence on the engine (depending on how much change there is), which can also effect the shift points.

  4. #4
    LH Electronics Specialist
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    Reset the PCM.

    Change the fluid and the filter. Clean the metal debris off of the magnet and look for clutch material in the fluid. Use only ATF+4 fluid, other fluids will cause poor performance and accelerated wear.

    Also check your transmission mount.
    2004 300M Special...240,600 miles!
    Suspension overhaul in progress. Electrical gremlin extermination in progress.

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