My stock bushings were shot...and, shock bushings in general take a beating.
The rubber ones that most shocks come with are quiet, and last long enough under normal use for OEM apps.....the urethane (Prothane) bushings are harder, so they don't absorb as much vibration, etc...but they too wear out over time.
I got a new set for about $8 (Prothane) for the rears to fit over the larger diameter UBSkidderz shock bolts...an easy swap.
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- TJ
2001 Xterra '03 VG33, SE 5 spd, 305/70/16's, Revolvers, UBSkidderz, Doubled AAL's, 3"SL/2"BL, winch/bumpers, skids, sliders, OBA, Snorkel, pine stripes....
Friends don't let friends drive stock.
http://www.gifsoup.com/view/501230/tj-tackling-crawlers-ridge-o.gif