RIGID  Off Road Bumpers & Vehicle Armor for XJs & MJs

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‘Death Wobble’

   is that condition of the front end shaking violently when irregularities in the road surface are encountered. It usually is speed-sensitive - only seems to occur at certain speed ranges. "Death-wobble" has been reported to be caused (or combinations of causes) by:  
   

; improper front-end alignment

  • - some sources report that castor-settings below 4 1/2 degrees will cause 'Death Wobble'.

  • Most Off-Road shops that we've talked to said that a castor setting of between 4 1/2 and 7 1/2 degrees seems to work OK. 

  • We set the castor on our rigs at 5 1/2 to 7 degrees & toe-in at 1/16 to 5/32 inch depending on tire size & weight - larger and heavier tires require more castor and toe-in.)  

  • It is also important to have between 1/16 and 3/16 of toe-in.

  • Toe-in settings that are "0", " - "(toe-out) or near "0" seem to aggravate 'Death Wobble. 

 
   

; loose or improperly installed track bar

  • - the front axle must be centered under the frame for proper tracking.

  • Also try to get the track bar and drag link as close to parallel as possible.

  • Check both mounting points carefully for loosening.

  • Whether you have a tie-rod style or flex joint-type mounting - be sure to check for any wear in the joint.

  • It's really a good idea to make this part of your normal maintenance routine.

 
   

; loose or bad tie-rod ends

  • - any loose tie-rod end in the steering linkage is BAD NEWS! 

  • Be sure to check these often - like before and after any off-roading. 

  • Keep them well greased - and - make sure the grease/shield boots are in place and in good shape.

  • A good idea is to replace the rubber boots with urethane boots whenever possible. 

  • (If you have to replace your tie-rod ends - PLEASE use a good aftermarket name-brand tie-rod end, i.e. MOOG, etc. - this not a good place to save $$'s)

 
   

; worn ball-joints

  • - just like tie-rod ends - any play in them is BAD NEWS! 

  • Keep them well greased.

  • It's a lot cheaper to maintain them than to replace them.

  • (If you have to replace your ball joints - PLEASE use a good aftermarket name-brand ball joint, i.e. MOOG, etc. - this is not a good place to save $$'s)

 
   

; loose or improperly installed control arms 

  • - Control arm mounting bolts must be kept tight.

  • Check them often when off-roading.

  • If you have replaced the stock units with aftermarket control arms - be sure to follow the manufacturer's instructions.

  • Use the proper mounting hardware and torque.

 
   

; *loose steering box 

  • - sometimes the steering box mounting bolts will start to pull through the UniFrame under heavy steering loads (i.e. large tires, extreme articulation) causing the steering box to loosen.

  • If you run large tires (33 inch & larger) and do some extreme off-roading, you should make re-torquing the three steering box bolts and checking for 'pull through' part of your normal 'before and after' vehicle maintenance routine.

  • Our 6- inch Reinforcing Side Plates (part of our Front Bumper Mounting System), properly installed will eliminate 'pull-through.'

 
   
  • ; *front-end frame flex

    • - stock Uni-Frame bulkhead is marginal with stock vehicle height and stock tires. 

    • When an XJ is lifted and larger tires are installed the front bulkhead is just not strong enough to control front end flex. 

    • There are aftermarket frame struts which stiffen the front end. 

    • Our solution was to build a Front Bumper Mounting System for our bumpers that reinforces the bulkhead . . .

    • And that along with the side plates and bumper form a 'box-structure' to stiffen not only the bulkhead but also the front frame horns.

 
* The GOOD NEWS is that ‘front-end frame flex’ and ‘loose steering box’ are almost always eliminated as causes of "Death Wobble" by proper installation of our Bulkhead Reinforcing Plate and Side Reinforcing Plates.

 

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Last modified: 12/08/03