If the truck will roll, put it in high gear, and roll the vehicle back and forth. If the crankshaft turns, the engine isn't locked up. If the wheels slide, DO NOT go to the next logical step and try to tow it, or get it rolling and pop the clutch! That's a good way to bend rods, or break an axle or a driveshaft, or maybe trash a transmission.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!