I have 200K on mine. All stock, no modifications, and original. I changed the trans fluid and filter last spring when I replaced the solenoids. Found a 2 inch piece of a snap ring in the bottom of the trans pan. Took out the piece and put her back together and filled her up. Still going strong. Trans makes noise and I know it is getting close to a rebuild. Will drive it till rebuild is required. It will then get built with parts that are upgrades only for longevity. I have had only one other issue and that was an injector. Aside from that she is beautiful and my goal is 500K or more. I have no intentions of modifying this truck. Engine mods are where the trans goes south fast. The trans is built to just barely handle the stock engine output.