my truck doesnt run hot it stays right around 180 but even when warm the top hose isnt hard. i can squeeze it flat with ease and i can remove the radiator cap at any time.

the radiator is brand new, the hoses are brand new, im running an aluminum high volume pump, march aluminum pullies and a 180 thermostat

It sounds like its time for a new cap... the old one isn't holding pressure.

If cap good, go to a 195

If the cap was bad or it lost pressure it would over heat. The truck prob. runs cool and The thermostat is prob. stuck. open.

Even if the stat was stuck open the temp would still be high enough to create pressure and not necessarily cause over heating.

The cap creates a pressure valve allowing warmer temperatures to be reached before engine boil over resulting in coolant looses that will ultimately result en engine overheating. for each lb of pressure the boiling point of the coolant is increased allowing warmer temps to be reached before boil over.
"The radiator cap actually increases the boiling point of your coolant by about 45 F (25 C). How does this simple cap do this? The same way a pressure cooker increases the boiling temperature of water. The cap is actually a pressure release valve, and on cars it is usually set to 15 psi. The boiling point of water increases when the water is placed under pressure.

When the fluid in the cooling system heats up, it expands, causing the pressure to build up. The cap is the only place where this pressure can escape, so the setting of the spring on the cap determines the maximum pressure in the cooling system. When the pressure reaches 15 psi, the pressure pushes the valve open, allowing coolant to escape from the cooling system. This coolant flows through the overflow tube into the bottom of the overflow tank. This arrangement keeps air out of the system. When the radiator cools back down, a vacuum is created in the cooling system that pulls open another spring loaded valve, sucking water back in from the bottom of the overflow tank to replace the water that was expelled.'

Time to put a pressure tester on the system. You probably have a very minor leak preventing the system from pressurizing.Why were all the parts replaced?

does the valve on the underside of the cap dangle freely? if so, you have a "weighted vacuum valve" cap. a lot of mopars came with these caps. they are designed to allow the cooling system to operate at ambient pressure under normal conditions. if there's a sudden increase in temperature, the valve is supposed to seal, allowing the system to pressurise. check the cap for that valve.

I have the same cap and my system doesn't pressurize either, unless I start working the engine. I can squeeze my hose as well, but it runs 180 all day long even in 90* heat under normal driving.

Why look for a problem where there ain't none. If it isn't heating or leaking leave it alone.

Bottom line: IF IT AIN'T BROKE - DON'T FIX IT