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The thermostat type depends on the water crossover used, if it's the older 6.2 or the newer type used on the 6.5 NA from GEP. Both type can be used on either engine. Just take the old out and post a pic. Or a pic of the water crossover. if you have a 6.2, it's most likely a 6.2 crossover...

Sounds like you have done your your home work, carry on.... have you checked the actual coolant temp with a laser thermometer? The gauges are notoriously inaccurate. also, have you repalced the coolant bottle cap with a new "correct" 15psi.

You have not mentioned anything about why you think you truck is overheating. Your truck should not overheat due to a bad fan clutch. That fan clutch defaults to locked on. I seriously doubt the friction pads in the clutch are bad. what are your overheating symptoms?