i just installed a set of timbrens on the rear of my 97' F-350 to better handle the weigh of my loaded v-box. my question is, of the guys that have them installed, how long have you been using them? do they show any signs of wear or tearing? i cant believe these things will last very long. maybe im wrong but for $230.00 i guess i expected a little more. if they do the job i might get a set for the front also. thanks.