Great.

You can replace it in one of two ways. You can replace it along with the harness by dropping the valve body, or just the solenoid itself.

If your wiring harness is in good shape then you'll probably elect to just replace the solenoid.

Look over on the right side of the valve body and you'll find the solenoid mounted there. If you have an electronic governor then you will also have a governor solenoid and governor transducer mounted on the right side of the valve body, on a small block called the governor body. Start by removing the four 7/16" bolts and two T-25 Torx screws that hold the governor body to the valve body. Drop it down, unplug the transducer and solenoid. Set it all aside as an assembly. The solenoid pack you are replacing is now exposed.

At this point, or if you don't have an electronic governor, you are ready to remove the solenoid pack. It's mounted to the valve body with three T-25 Torx screws. Remove these three screws and the solenoid pack will come down.

The wiring harness should be zip tied to the solenoid bracket. Cut the zip tie, unplug the solenoid from the harness and remove it. Reverse this to install the new solenoid.

If you want to remove the valve body to replace it then start by chocking the wheels and/or setting the emergency brake. Remove the shift linkage, throttle valve linkage, and then the arms where they attach to the trans on the left side. Unplug the solenoid connector just behind the shift linkage.

Use pliers to turn the manual valve fully clockwise.

Remove the 10 7/16" valve body bolts and drop the body down. As it comes down you'll need to remove the C clip from the park rod on the left side, push the park rod up off the rooster comb and leave it in the transmission. As you drop the valve body you'll find an accumulator piston with either one or two springs on the right side.

After the valve body is out then you can remove the solenoid and harness together.