It was hard not gonna sugar coat it. You need the oring for the solenoid harness... You do not need the solenoid body gasket as long as it does not tear. Its best to have a second pair of hands. When removing the solenoid body(you will et wet with oil), only remove the 8mm bolts(21 of them). When lowering the body down, you will see a spider looking round metal thing, this thing is an orifice for the forward over drive gear, pay attention to wear it goes, and also pay attention to where the piston that engages drive, and the gears at the shift lever(if the piston does not get set back, the truck will not shift and might not start).
Once the solenoid body is on a clean work bench, go to the wiring harness, and lift the tiny plastic tab- while doing this twist it counter clock wise and it will pop up allowing you to gain access to the solenoid... Reverse the process and torque the 21 bolts to 89inch lbs.