I have a 1990 Toyota pickup, and I noticed when I got stuck in some sand that only the passenger side back tire spins, while the driver's side does not. Any ideas why?
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Your truck is most likely equipped with an open differential. This is a normal condition. A few vehicles are equipped with what is called Posi-Traction, Sure-grip or locking differential. These differentials are equipped with internal clutches that spin both rear tires when moving in a straight line. When going around a turn the clutches release allowing the tires to turn at different speeds.
Your handbrake may not be disengaging properly. I don't know the car, but if you have drum brakes, it may be that they were incorrectly set, which means your brake is always partially engaged.