Why is my truck screeching?

Hello, sounds like a belt related concern. The belt drives multiple pulleys under the hood on the front of the engine, such as the water pump, alternator, air conditioning compressor and power steering pump. There is also an idler and tensioner pulley that keeps the belt routed properly with the proper tension. If any of those pulleys - and related components - is binding, the belt will screech as the engine's crankshaft continues to try and drive the belt against a pulley that is resisting. Hands on testing is needed, and I expect some kind of more substantial repair may be required. Driving the truck like this is not advisable. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops