What exactly is death wobble? and what causes it?
Death Wobble is the ultimate symptom caused by a billion problems. It is the universal symptom... much like a headache is the universal symptom for medicine. What caused the headache is what needs to be treated...
* that gaping head wound and the broken skull?
* loss of blood and a ruined carpet?
* stopping drinking alcohol or beer?
* drinking too much alcohol?
* too little caffiene?
* too much caffiene?
* allergies?
Etcetera, etcetera, etcetera....
A
partial list of causes for death wobble includes: out-of-round tires, poorly balance rims, insufficient toe, loose shackles, worn bushings/ball-joints/bearings, inadequate kinpin/ball-joint preload, too little caster, too much caster...
All that and the net result feels much the same: front wheels that shimmy and hop uncontrollably at certain speeds. At its worst, DW can feedback throughout the whole steering/suspension system in a harmonic resonance that can put you out of control and into a ditch.
Solutions... well, there is no one-size-fits-all solution. There are a host of
different solutions for
different vehicles based on the individual root cause of the universal symptom, DW. A
partial list of solutions includes: running low tire pressure to heat the carcass into higher compliance, balancing rims/tires, front-end alignment (caster, toe, etc), replace loose/worn bushings/ball-joints/bearings, shim kingpin... and maybe even more band-aids, such as running low tire pressure to damp/change the resonant harmonic of the steering system, castering artificially high, over-tightening bolts to preload bushings, and of course, the venerable steering stabilizer (more must be better, right?). Still other modifications exist that may damp the DW symptoms without actually changing the cause -- some folks talk up hydraulic steering as the obvious solution to DW... personally, I think it is just another band-aid (albeit one that helps in the boulders). It's way better, IMHO, to fix the problem and eliminate the symptom than it is to cover it all up and hope for the best. When you hear a belt squealing its death knell, do you turn up the radio or break out the tools and fix it RIGHT?
I'm always frustrated when I see someone touting 'their' fix as the silver bullet that will take care of ALL death wobble. <img src="/forums/images/graemlins/rolleyes.gif" alt="" /> There's rarely just a single silver bullet, you'd need a whole box of ammo to shotgun most DW -- it can derive from soooooooo many sources. BTDT. <img src="/forums/images/graemlins/frown.gif" alt="" />
Tell us more about your setup -- what you've checked and what you suspect....
Randii