2004R odd downshifting problem

Discussion in 'The "Juice Box"' started by Paige67, Dec 25, 2018.

  1. Paige67

    Paige67 Well-Known Member

    Hi all,

    I have a 2004R in my '67 Skylark behind a 340. The previous owner did the swap. The transmission shifts great through all gears. However, there seems to be a problem when cruising in 4th and downshifting. When you push the accelerator down and the transmission downshifts, it will downshift then immediately shift back into 4th, then downshift again and immediately shift back into 4th. It will continue to rapidly cycle between gears like this until you let off the accelerator. If you manually downshift the transmission with the shift lever, none of this occurs and it downshifts smoothly.

    Does anyone have any suggestions on what could be causing this odd behavior?

    Thank you!
  2. TexasT

    TexasT Texas, where are you from

    Do you have a gauge to see about the line pressure? I would try adjusting the tv cable but you need to make sure the Line pressure jumps when the cable is actuated.
    I'm not sure of the mods or shift kit your trans has so it is hard to know what else to suggest. Line pressure can do wonders or cause problems. A lot depends on the original setup(vb and governor combo).
  3. Matt69olds

    Matt69olds Member

    There is a thread on the Turbo Buick forum discussing a 2-3 shuttle shift condition. I don’t know how to post a link, the thread was started on sept 30th. The title of the thread is 2004r 2-3 shuttle.

    I have occasionally had this issue on the 2004r rebuilds or installs I have been involved with. Usually adding or removing a couple clicks to the TV cable adjustment solves or eliminates the issue. Who built the trans? Any modifications?
  4. Kaule

    Kaule Gold Level Contributor

    i can't help with the problem, but i can post the link :D

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