Four wheel drive not working properly

Tiny
MARK FERGUSSON
  • MEMBER
  • 1991 JEEP CHEROKEE
  • 4.0L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
Just bought the vehicle listed above with the 231j transfer case. Every time I try and put in 4x4 only a part time light shows up on dash and front and back won’t lock together. I’ve tried looking it up and reading stuff up on line but no luck. Everything says something about vacuum lines or vacuum actuator/shift motor on front axle tube. But there is no actuator/shift motor mount or location on front axle tube. Can anyone help me?
Wednesday, April 7th, 2021 AT 8:23 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,053 POSTS
Hi,

I have to be honest. I never saw one made without a shift actuator. It should be on the passenger side of the axle facing toward the rear of the vehicle.

I attached a pic below of the shift motor on the axle. It is operated by engine vacuum, so if you locate it, disconnect the vacuum hose, start the engine, and see if there is vacuum present.

Let me know what you find.

Joe

See pic below.
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Thursday, April 8th, 2021 AT 8:52 PM

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