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This has so many variables...is the serpentine belt the original? It can be hardened with age, quiets when warmed up...could be tensioner pulley, this noise could come and go however...also is your weather very cold? If equipped with an automatic transmission, the age can exhibit unique cold sounds...if tranny never serviced, add a bottle of Lucas Oil Transmission Stabilizer to tranny fluid...read instructions, you do not have to drain anything...This is highly recommended for cleaning tranny. Hope this helps.
the gears are not moving when the car is in park, therefore, no noise from the trans.. it is coming from somewhere else. quite possibly, it's the starter motor is continuing to spin. have someone listen under the hood while starting. if it is the starter, the noise will be more prominent when listening from under the hood. how long does the noise last?
the four wheel drive uses vacuum hub locks. there is a vacuum solenoid on the passenger firewall in front of the battery box. sounds like you need a updated solenoid and possibly one or both hub locks. what happens is the old style solenoid vent allows water to get in and the hub locks freeze or stop working because of the water. the new style has a cover over the vent to prevent water from getting in.