I bought my Tacoma new in 07. I recently developed a vibration about 27 to 35 miles an hour. Had all three u-joints replaced. About 60 days later the vibration returns. Have the front one replaced. A week later the vibration starts again. Take it to Toyota and they replace the back two u-joints. The vibraion is not as prevelant but still happens. Now they are telling me the transmisson has to be replaced. YIKES! Any ideas? HELP!