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284 5-speed shuddering on right turns

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  • 284 5-speed shuddering on right turns

    I've got this weird side-to-side (lateral) thrashing/shuddering on acceleration in right turns. It's done the same thing with two transmissions. So far I've replaced both axles trying to solve it.

    Most recently I thought I'd found the cause when I could move the inner tripod around on the driver's side. I installed an output support bearing in place of the driveshaft seal, but it had little effect. If you haven't seen one of these before, it's an ingenious device usually used to reinforce 282's that looks like this:



    I've been planning to try installing one of these on the jackshaft side, but there's no inner tripod movement there so I don't expect much other than a split casing (these are pounded in with a sledgehammer). I'm not sure what else it could be, but the problem persists.

    92 ASC GTP - 3.4 5sp, HUD, DIC, AQ9's
    88 Fiero GTs - L32 3.4 5sp & ZZ430 5.7 SBC V8 5sp (the twins) L32 -> LQ1 swap is underway
    6sp LS1 Corvette Roadster (parts getter)
    '99 Expedition (tow truck)
    '09 G8 (new toy)

  • #2
    What prompted you to start with the tranmission/axles as the fault? The forces of lateral movement shouldn't be tranmisted to the transmission or axles but rather be absorbed by the hubs, ball joints, tie rods, rack, suspension, etc. For any of that movement to be tranmitted to the transmission that would mean something else is broken or worn and allowing the axles to be tugged/pushed. If your on the second transmission with the same problem that is also an indicator that the tranny is not at fault.

    Are you trying to say that you believe the source of the shudder is origination in the tranmission and only on right turns? If so then that would be a different story but I don't see how that could happen, and the chances of 2 trannys having the same problem doesn't seem likely either.
    Last edited by jmgtp; 04-02-2009, 03:39 PM.
    1991 Grand Prix GTP LX9swap/Getrag 284 --- SOLD =(
    1994 Corvette
    LT1/ZF6
    2006 Dodge Dakota 4x4
    3.7/42RLE

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    • #3
      I looked at the transmission and axles as being at fault because they are among the only things that have reciprocating movement during a turn. If I coast through the right turn, I don't feel anything at all. It's only when I'm hard on the gas. That's why I don't believe it's anything in the suspension. Accelerating in left turns or straight is smooth. The transmission replacement was unrelated to this problem.

      However, I have replaced other things from your list due to other issues, but not trying to troubleshoot this problem specifically. This includes:

      - both front lower ball joints
      - both front tie rod ends
      - steering rack

      The one thing you've pointed out that truly gives me pause is the hubs. I think that's a really strong possibility and about the only other thing that could cause this.

      92 ASC GTP - 3.4 5sp, HUD, DIC, AQ9's
      88 Fiero GTs - L32 3.4 5sp & ZZ430 5.7 SBC V8 5sp (the twins) L32 -> LQ1 swap is underway
      6sp LS1 Corvette Roadster (parts getter)
      '99 Expedition (tow truck)
      '09 G8 (new toy)

      Comment


      • #4
        I think what you might be feeling is wheel hop. If you're accelerating hard when you're turning, it's very possible you're taking all the load off the wheel. Have you tried replacing your struts and/or sway bar bushings? Also, what condition or your tires in? If any of those are worn out, that will induce wheel hop.
        I may own a GTO now, but I'm still a 60V6er at heart.

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        • #5
          Thanks for the suggestions Josh, but the sway bar bushings are fine and it's the same ZRi tires you've got, and they're practically brand new (~10k miles). It's definitely not wheel hop, it's not a traction issue...

          92 ASC GTP - 3.4 5sp, HUD, DIC, AQ9's
          88 Fiero GTs - L32 3.4 5sp & ZZ430 5.7 SBC V8 5sp (the twins) L32 -> LQ1 swap is underway
          6sp LS1 Corvette Roadster (parts getter)
          '99 Expedition (tow truck)
          '09 G8 (new toy)

          Comment


          • #6
            Originally posted by jmgtp View Post
            What prompted you to start with the tranmission/axles as the fault? The forces of lateral movement shouldn't be tranmisted to the transmission or axles but rather be absorbed by the hubs, ball joints, tie rods, rack, suspension, etc. For any of that movement to be tranmitted to the transmission that would mean something else is broken or worn and allowing the axles to be tugged/pushed. If your on the second transmission with the same problem that is also an indicator that the tranny is not at fault.

            Are you trying to say that you believe the source of the shudder is origination in the tranmission and only on right turns? If so then that would be a different story but I don't see how that could happen, and the chances of 2 trannys having the same problem doesn't seem likely either.
            I'm going to agree with John on this one. Main reason being what he mentioned already, and getting on the gas in a corner is going to change suspension geometry on suspension parts that are worn. I will admit, the axle would have been one of the places I would have looked at too.
            Last edited by pocket-rocket; 04-07-2009, 10:17 PM.
            -60v6's 2nd Jon M.
            91 Black Lumina Z34-5 speed
            92 Black Lumina Z34 5 speed (getting there, slowly... follow the progress here)
            94 Red Ford Ranger 2WD-5 speed
            Originally posted by Jay Leno
            Tires are cheap clutches...

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            • #7
              If you're looking at causes internal to the transmission, you'd have to start with the diff. It is an open diff, but if something is worn out or broken in it, it may have difficulty turning independently of each wheel under load.
              I may own a GTO now, but I'm still a 60V6er at heart.

              Comment


              • #8
                I don't think it's anything in the transmission. For it to do the same thing with two different ones just seems like too much of a coincidence.

                92 ASC GTP - 3.4 5sp, HUD, DIC, AQ9's
                88 Fiero GTs - L32 3.4 5sp & ZZ430 5.7 SBC V8 5sp (the twins) L32 -> LQ1 swap is underway
                6sp LS1 Corvette Roadster (parts getter)
                '99 Expedition (tow truck)
                '09 G8 (new toy)

                Comment

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