Installed new motor and wiring harness ever since transmission has been acting up intermittenly tow/haul light will flash once in awhile been to two transmission shops no codes now no matter what hear you select it goes forward even in park it is in a bind checked linkage and cable all looks good fluid is clean not burnt 2004 truck with 2006 motor never pulled a trailer just the welding machine and bed don't know what to do with it now