I got a horrible case of death wobble this past weekend. It took me less than a minute to find the culprit, which was the castle nut loosened on the tie rod. The loose nut, and wobble, ended up hollowing out the tapered hole in the knuckle. I'm now having to replace the passenger side knuckle for the second time in less than a year. It also took out the new rubber grease boot I had just put on the Rock Jock steering.
I'm positive I torqued the castle nut to 55 ft lbs and didn't have more than 3,000 miles since doing the last knuckle and grease boot swap. I'm hoping that the issue was the last replacement was a used knuckle I had around, which I didn't closely inspect. A new knuckle will be here today, so wish me luck!
Out of curiosity, assuming the cotter pin fits into the castle nut, is there a reason not to use a flat washer underneath the castle nut? This is still the old knuckle and I have one there now, pending the new knuckle arrival.
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