GM Repair Problems? Ask GM Repair Expert Now.
Hello and welcome to Just answer,
What size engine do you have in your GMC?
Below are the instructions, the Italized portion will only apply if you have 4wd, let me know if you have any questions on this
The starter is located on the passenger side bottom rear of engine, #6 in the diagram below, It is not too difficult of a job it is accessed from the bottom of the truck, make sure you disconnect the battery negative cable before attempting to replace, It might be easier to remove the 2 bolts that hold it to the engine first then allow it to hang but support it, then remove the wire connections.