I had mine replaced at 50,000 but with a lot of grief and phone calls. See my old post "+100 cool points to Isuzu" If you need more. They were only peeling on the inside and it was REAL BAD!
Good luck
Alan
2001 Ironman Daily Driver... 3.5" suspension lift (OME912 springs and 1" spring spacer), ball joint flip, 1.5" front diff. drop, 33"x12.5 TrXus MT, 16x10 Eagle Alloy rims, Interceptor, PV muffler, K&N air filter, Alpine Supercharger, Bilstein shocks, and some trimming.
2000 Ironman Project LS-1 VX... very slow progress but someday....... ohhhhh someday......