Jack the truck up and place on appropriate jack stands for safety. Remove the tire and there is two 3/8 Allen head screwson the back side of the brake calipers. Back these out (they will not rmove completely) and remove the brake caliper from the rotor. The rotor will then slide straight off the lug stems.
Drums are not a job for beginners. With the right tools & a manual you could do it.
R134a
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1988 to 2000 GMC & Chevrolet pickup truck parts are, for the most part, interchangeable.
You need three Polocks!
How do you rebuild a differential for a 1981 GMC pickup?
How do I replace the fuel fiter on my 2000 gmc Yukon 5.3 XL?
To change the transmission fluid on a 1964 V6 GMC truck, you will need the manufacturer manual.
Change it exactly when your owners manual specifies. Or you can change it every 5,000 miles.
remove the old pcv valve by pulling it straight out of the valve cover, pull the hose off the other end. Installation is the reverse of removal.