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why won't my car downshift?

This is a discussion on why won't my car downshift? within the Automatic Transmission forums, part of the Drivetrain category; Whenever its in fourth gear like on the highway and I floor it the car won't downshift, so I have ...

  1. #1
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    why won't my car downshift?

    Whenever its in fourth gear like on the highway and I floor it the car won't downshift, so I have to downshift manually. Anyone know why it does this? Shouldn't it downshift into 2nd when I hit WOT?

  2. #2
    Senior Member SeVeReDiStOrTiOn's Avatar
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    05 Wrangler
    00 Z28 sold :-(

    OoOoOh the legendary "dead spot" in the 4l60-e You either have to get a higher stall TC or find out which speeds kick down and which don't. I know anywhere in the 60mph range and it kicks down hard...40-50 it never does...and 28ish and under it'll slam into 1st hard. Just spend some time crusing on a open road at different speeds and see where yours kicks down.

    BTW...did you swap gears/rear from a M6 car?

  3. #3
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    Yes I swapped rearends from an 02 Z28 M6 but I kept my axles.

  4. #4
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    Did you re-tune the PCM for the new gears?
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  5. #5
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    Yes I did reprogram it for the new gears. Can I program it to downshift from 4th to 2nd?

  6. #6
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    going from 4th to 2nd at 80 mph isn't a good thing to do. it should go to third, though.
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