If you are needing to drain the entire P/S system then the first answer is right on. If you just want to change the fluid (not a bad idea on this older truck....so go synthetic) you can get a squeeze bulb at any auto supply. I've used them for this purpose and others...even an anti-freeze tester can do the trick in a pinch. A squeeze bulb will get most of the P/S fluid out of the reservoir, draw down an overfilled battery (or brake fluid reservoir too) and it's cheap.