F250 SUPERCAB 4X2 W/ 7.3L, E4OD TRANS MAY EXHIBIT A VIBRATION OR SHUDDER DURING START UP ACCELERATION DUE TO A LARGE DRIVELINE ANGLE. INSPECT REAR SPRING. IF # F2TA-5560-VB IS ON VEHICLE, REPLACE THEM W/ SERVICE PART F5TZ-5560-D (ENG # F4TA-5560-TA). ALSO INSTALL 2 1/4 INCH SHIMS (E0TZ-4A209-A) BETWEEN THE CENTER SUPPORT BEARING AND THE SUPPORT BRACKET.