why is my sport trac overheating?

Ok, Changed the fan clutch and it still overheats! :(

Was it already doing this before replacing all those parts?

I have owened the truck eight years and it just staeted acting up. It started overheating and the reservoir tank was empty. I looked for a leak and found that the pump was leaking. Replaced the pump, hoses, radiator cap, thermostat,drained and replaced the coolant. (Note: thermostat was broke in two pieces) the next day it started overheating again and leaking again. Pressure tested it and found it leaking around the thermostat housing. Replaced housing and sensors. Still over heating so I replaced clutch fan, and washed out radiator. I marked the overflow tank and it seems to be holding steady.

How high does the temp go in traffic?

My temp gauge pegs at 260, check engine light will come on. This all happens faster with the air conditioner on. Factors all change depending on how slow im going and how hot it is outside.

I know you did the clutch, but it sounds like an airflow problem. When it gets hot can you hear the fan if you rev the engine? It should be pretty noticeable. There's a chance you got a bad one.

The clutch is definitely working, kind of embarrassing loud as a friend of mine said.