My 95 Vortec 350 that's in a FJ40 isn't giving any vacuum to the power brake booster. What could cause this? I thought some of you chevy guys might know something. Everything else runs fine.

Could have a hole in you booster diaphram. Do you hear a hissing sound when you apply the brakes?
Best way to check this is push on the brake pedal, then start your truck. Your pedal should drop about halfway and stop. If it doesn't do this more than like your booster is bad.
Check your hose connection, and vacumn signal from the manifold.:skull: