Heats up at 70+ mph

T man

Registered
Hey guys. My coolant system is relatively new but on the drive to work the cars thermostat starts to climb as I go over 70mph.

I burped the car yesterday and just went for a test drive but it's still happening. The car runs I believe 2500 rpm @ 75 in forth but I can run the same rpm around 50 or 55 in 3rd without and issue? Any ideas?

Not sure if it matters but The car has a transmission rebuild with a 3200 stall converter and runs low boost on a ford racing crate. Gears are 3.73
 
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