Your truck does not overheat but can I still have a cracked block?

Yes you can.

A cracked block does not necessarily mean the car will overheat.

If a block is cracked at a coolant jacket then coolant will leak out and the car will overheat if the leak is bad enough.

If the leak is not very major or if the crack is at a point that does not have a coolant jacket then it will not overheat.

A cracked block could leak oil, compressed air/fuel, coolant, or nothing at all and still be cracked. -R. Mesyef