Bottom rear of engine. Follow positive battery cable to it if you have trouble locating it. Have starter tested before replacing.
Replacement procedures are below..
Disconnect the negative battery cable.
Raise the front of the vehicle and install jackstands beneath the frame. Firmly apply the parking brake and place blocks in back of the rear wheels.
Tag and disconnect the wiring at the starter
Remove the starter mounting bolts and remove the starter.
Please be aware that the starter motor is quiet heavy usually so be cautious of this to prevent injury.
Position the starter motor against the engine and install the mounting bolts. Tighten the mounting bolts to 15-19 ft. lbs. (21-27 Nm).
Install the starter solenoid connector by pushing it straight on. Ensure that the connector locks in position with a notable click.
Install the starter cable nut to the starter solenoid B-terminal. Tighten the nut to 80-123 inch lbs. (9-14 Nm).
Connect any remaining wiring to the starter motor.
Lower the front of the vehicle and remove the wheel blocks.
Connect the negative battery cable.