Hey all, have a slight prob. My truck starts overheating if I run it at high (75, 80,.....*wink-wink*) speeds. I have a big block 4 core radiator, new fan clutch, new hoses, new t stat, etc etc. Temp gauge doesnt move if i idle in 100 deg weather in traffic all day long. But if i get it up to 80ish(yeh yeh swampers aint rated for that) it starts creepin up, but the second i drop down to 65 or so it cools right off. I only have about 3/4 of a fan shroud, I can get another for abt 30 bucks shipped, just wondering if thats the prob. Thanks guys.