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The issue seems to be time-in-the-saddle or mileage. Many of us have changed to brass bushings and heavy duty shackles at between 10 and 20 thousand. Of course some have gotten longer life, but that seems to be the exception.
drknapp, "wet" bolts are bolts with zerks in the head so that they can be lubricated with grease. Brass bushings are used with the wet bolts which when lubricated, are longer lived than the OEM nylon bushings. At the same time, folks use a heavy duty shackle which is half again as thick as the OEM shackle. If you do a search, you can see pictures of both damaged shackles and bushings along with the installed new equipment.
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