Unfortunately, I can't give you a specific location without knowing the exact engine model.
Here's how to find it:
1. Check your owner's manual: It will likely have a diagram showing the location of the PCV valve.
2. Locate the valve cover: The PCV valve is usually mounted on the valve cover. Look for a small, round valve with a hose attached to it.
3. Consult a repair manual: A repair manual specific to your truck's engine will have detailed diagrams and instructions.
4. Look for a PCV hose: The PCV valve connects to the engine intake manifold via a hose. Trace this hose back to find the valve.
Remember: If you're not comfortable with automotive work, consult a qualified mechanic.