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Thread: 84 Fleetwood driveline vibration

  1. #16
    Join Date
    Sep 2004
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    Re: 84 Fleetwood driveline vibration

    no, suspension is loaded on a ramp hoist.


  2. #17
    carnut is offline Cadillac Owners Master
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    Re: 84 Fleetwood driveline vibration

    Torque converter lock up above 55? A mismatched flywheel to torque converter can cause a vibration once the converter locks up just above 55 MPH. Can you disconnect the lock up wiring at the trans and drive it. What trans is in it?

  3. #18
    Join Date
    Sep 2004
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    51

    lowered 3", can't adjust pinion to eliminate vibration

    hey all, I have an 84 fleetwood and I lowered it 3", and have had a driveline vibration since. I've had the driveshaft balanced, alignment, tire balance and every other possible thing done for vibration. I've figured out that its my u joint working angle causing my vibration. Put adjustable rear upper control arms in, but I can't adjust the pinion up enough to match the transmission angle. the trans is running at around -4 deg and the pinion is running -2 deg. the transmission is at its limit and almost hitting the floor boards so i have to settle for the 4 deg. but the pinion when adjusted up, once it takes any power the yoke starts hitting the pinion snubber frame. anyone else ever come across this, or have any ideas short of cutting the snubber frame out? really want to keep the low stance and not go back to stock height.

  4. #19
    carnut is offline Cadillac Owners Master
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    Re: 84 Fleetwood driveline vibration

    Is this engine bolted to the original transmission? Above 50 MPH the original trans locks up the torque converter. If the torque converter is unbalanced or the clutch within it is burnt, it will shudder unless the brake pedal is slightly depressed to dis engage it. Try driving at a steady 55 then keeping your foot on the gas pedal, depress the brake pedal with your left foot. If the vibration quits, I would suspect an unbalanced torque converter to flex plate because of the engine swap.

  5. #20
    jayoldschool's Avatar
    jayoldschool is offline GM RWD V8 addict
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    Re: 84 Fleetwood driveline vibration


  6. #21
    Join Date
    Sep 2004
    Posts
    51

    Re: 84 Fleetwood driveline vibration

    ya its a rebuilt 700r4 but its definitely not the internals of it because even with the engine off and rolling down a hill its still vibrating. thats the second time i've seen that link tonight so it must be good lol gonna give it a try!

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