Should front drive shaft be spinning when in 2H?
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CAD = Central Axle Disconnect. On the passenger side of the front axle. Has a vacuum actuator, with two lines going to it.
Try this: Jack up the passenger front wheel of the truck. With the trans in park, T-case in 2-hi, try and spin the front driveshaft by hand. It should turn easily, and you shouldn't see anything else turning.
If the passenger front wheel turns, the cad isn't releasing completely.
If the shaft won't turn at all, something in the T-case is messed up.
Try this: Jack up the passenger front wheel of the truck. With the trans in park, T-case in 2-hi, try and spin the front driveshaft by hand. It should turn easily, and you shouldn't see anything else turning.
If the passenger front wheel turns, the cad isn't releasing completely.
If the shaft won't turn at all, something in the T-case is messed up.