Park the truck on a level surface, block the wheels so the truck can't roll in either direction, put transmission in neutral, crawl under the truck and starting at the rear axle try to turn the driveshaft in both directions. Oh wait, you probably have a torque tube drive, that won't work.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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