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death wobble

Discussion in '40- & 55-Series Tech' started by dylan, Sep 28, 2003.

  1. dylan

    dylan

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    at around 40 mph my recently finished fj45 shakes like a mofo as well as under hard braking. could it be:the 3" longer shakles on the back(the pinion angle looks okay),a unbalanced driveshaft or maybe tires?anything else? :cheers:
     
  2. hammerhead

    hammerhead

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    Did you lift the front with shackles too? Is it a wobble in the front end felt through the steering or a vibration from the drivetrain?
     
  3. dylan

    dylan

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    its not through the steering
     
  4. hammerhead

    hammerhead

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    Use an angle finder to check rear pinion angle. Use shim set to drop pinion back down to proper angle.
     
  5. hammerhead

    hammerhead

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    I bumped one up for you. Check out the "shims" thread.
     
  6. 1Fine40

    1Fine40 Rust Buster SILVER Star

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    :eek: I had a similar problem when I installed new lift springs a few years ago..found that the u-bolts were not completely tight after a few days of driving the rig..After re-torquing everything back to specifications, I had no further problems. :cheers:
     
  7. dylan

    dylan

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    actually the truck did this when i bought it a year ago (i thought it was just unbalanced tires) with original shackles. and i've put new tires and wheels on it as well so i think its driveshaft, u joint or brake related. when i reaf on the drive shaft it does not move(up and down).its smooth slower and faster than around 35 to 45 mph