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First check to see if the front drive shaft turns. If it turns then check for 4wd light. If no light then your vacuum shift motor is not working. On the top of your axle there is box bolted on the axle with an eletrical conector and two vacuum tubes. There are three reasons why it doesn't work. 1. There is no vacuum to the motor, check for vacuum pressure at the motor. 2. the solenoid (part where vacuum hoses connects) put about 15hg vacuum on outside vacuum port and block off inside port. With vacuum on jack up front end and try to tun drivers side tire. If drive shaft turns when you turn the wheel then problem is related to vacuum. if not then either solenoid is bad or the guide bushing inside is bad. Unbolt the shift motor and try to slide the spline conector back and forth. You should be able to push the connector over fairly easy, you might have to turn the tire a little. If it does not slide over the other axle then the bushing is bad and you'll need to pull the axle and replace. If it slides over the other axle then the solenoid is bad.

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Q: 1985 w250 dodge does not go into 4wd transfer case works?
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