my 97 3500 4x4 auto transmission dually hauled trailer just fine unhooked fine and drove off fine went put truck up backed up no issues in reverse put in drive and nothing no motion at all thought maybe didnt get it in drive good put in neutral and back down in drive and nothin put back in revers and backs up no problem so put back into drive and takes off like theres nothing wrong with it need info asap thanks

 

service and adjust it (new filter /adjust bads/fresh ATF+4