Ranger clutches can squawk sometimes, especially when launching aggressively or uphill or with a trailer. Mine does. Ford has issued several TSBs about this through the years.
I couldn't find the text from the 4.0L SOHC TSB but here is a similar quote for the 4.0L OHV:
A "squawking/eeking" noise may be heard from the clutch on acceleration from a stop or when under load in first gear on some vehicles. This may be caused by the 4.0L OHV engine allowing the clutch pressure plate to go into resonance when the clutch becomes 90% engaged. The clutch may be noisy, but function and life are not affected.