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  • 85 4+3 3rd gear off throttle stick vibration
  • 85 4+3 3rd gear off throttle stick vibration
  • 85 4+3 3rd gear off throttle stick vibration
  • 85 4+3 3rd gear off throttle stick vibration

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  1. #1
    Member
    Join Date
    Feb 2016
    Location
    Florida
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    29
    Corvette(s)
    1985 two tone blue Z51 4+3
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    Default 85 4+3 3rd gear off throttle stick vibration

    I have an 85 with the 4+3. I'm getting an off throttle vibration in 3rd gear. The stick will violently start shaking like it's coming out of gear. As soon as I touch the gas it goes away. Shifting is smooth and no grinding.

    I had the transmission out, and when I put it back in, I used a gauge tool in the side of the shifter for alignment so I could adjust the linkages.

    The OD seems to work fine. I have the first gear switch shorted so I can control it with the console switch.

    I didn't have this problem before, and I set the linkages according to the FSM specs.

    Could this be as simple as a slightly out of adjustment linkage? If I wasn't completely in 3rd gear wouldn't I have other problems on the gas?

    Worn 3rd gear synchro?

    Any ideas?

    Thanks

  2. #2
    Member
    Join Date
    Feb 2016
    Location
    Florida
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    Corvette(s)
    1985 two tone blue Z51 4+3
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    Default

    I was playing with the 3/4 gear lever on the transmission. I think the ball detent in 3rd has a problem. I detached the shift linkage pin for that gear and I can push lever into 3rd. But I can also push it slightly past the detent, and then when I release the lever it rocks back into the detent. I think the 3/4 lever mechanism on the side plate is worn and off throttle it is vibrating a little past 3rd and then into the detent. I'll have to take the side plat off and look.

  3. #3
    Member DonB's Avatar
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    Mar 2015
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    Chicago
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    Corvette(s)
    2019 ZO6 in Elkhart Lake Blue
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    Default

    Could the detent spring be worn or broken? I'm NOT familiar with the 4+3, but I've seen worn detent balls and broken detent springs in other transmissions. If it "goes in" easier than the 1-2, I'd look at the springs, etc.

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