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Hello. Welcome to Just Answer. Please allow me to assist you. The 'death wobble' that we have encountered comes from one of the following sources:
1) Weak or outherwise failed front stabilizer shock
2) Tire issues (as in construction or damage to the steel belts)
3) Tire balance
4) Bent Rims
Out of these 4 possibilities, tire issues are the rarest, unless you have hit a large pothole or debris on the road.
More often than not, the front stabilizer is the problem. The 'death wobble' is a sympathetic vibration that causes the front steering to oscillate. The steering stablizer (the shock absorber looking thing) is supposed to control this. If it is weak, the shock will not dampen the oscillations.
It is hard to say exactly what the cause is, without driving it. My recommendation to you would be to have the front stabilizer shock/dampener taken off and the stroke tested. If it moves inward with no resistance, it is worn out; replace it and test drive to see if the issue is cured. It would also be prudent to see if the rims are not bent and the rim/tire combination is in balance. The rims being bent can be checked whilst the rim/tire assembly is on the wheel balancer machine . This can be done at any good tire shop or repair facility.
If you have any questions, please feel free to reply. Please do confirm that you have received my input. Thanks.