4x4 Actuator

[wilbur]

I have this posted in the drivetrain forum as well, but thought I would try a forum with a little more traffic.

 

I am unable to engage 4WD on my 1992 K-Blazer w/ 350,000 miles on it. It was working fine on Sunday and I left it engaged when I parked it in the garage. Monday morning as I rolled down my snowy drive way and onto the unplowed county road it was obvious to me that the 4WD was not working. I tried dis-engaging/re-engaging but it made no difference. I do notice that the lever is much easier to pull into the 4-Hi position than normal. After searching these forums, I found the threads on the replacing the thermal actuator with an electric actuator per a service bulletin. Am I barking up the right tree? Any other diagnostic suggestions? I have owned this vehicle since new and have never had 4WD issues and all parts are original in the drivetrain, except for the u-joints on the rear drive shaft, which I replaced last weekend. All help is appreciated.

[Nytemare]

I answered your other post.