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What are the front caster readings?
Ask them and then let me know could you.
I actually had a question about a death wobble on here a few months ago and although I always ask about caster, I am not sure that was the fix. Let me see if I can find that post.
Ok, I cannot find that post I was talking about but the death wobble I was taught is a result most of the time by the caster. It was explained to me years ago like the front wheels on a shopping cart start wobbling when going too fast or hitting a bump and will not stop wobbling until you bring the cart to a stop. this is because the front wheels have extremely negative caster. Just the opposite would be the front forks on a chopper motorcycle. That is an example of extremely positive caster. So, if you recently changed the rear height and raised it by putting on air shocks, larger diameter tires or anything else, that would send the front caster more negative. So, the front caster should be checked. Then possibly even adjusted a degree more positive or if the rear height was changed, adjust to compensate for that.
Have you done anything to change the rear ride height?
I would have the front caster on each front wheels adjusted 1 degree more positive and try that.
Ok, remember I need to know the caster readings.
Yeah, that's way off. How can 3 alignments be one without them seeing that. Anyhow, I bet that is the reason for the death wobble. From what I see, the caster should be about 3-4 degrees positive.