My daughter has the above truck with 90K miles on it with codes 32,72,79, and 81. Any idea where to begin on each of them besides loose or damaged wires or components? I believe 32 involves the EGR circuit and the other 3 are tranny related (speed sensor, high fluid temp, and shift solenoid- 2nd and 3rd). She does have one of those heavy-looking service/utility beds on it with doors and I have been telling her she needs to have her boyfriend put a regular bed on it (it was used as a maintenance service truck at an airport). Thanks for the help.