Hello there. I just recently purchased an 89 z71 a few days ago and the front axle does not pull at all when shifted in 4 lo or 4 hi. I did a little research and read up alot on the actuators. Much to my surprise the truck has already been retrofitted with a newer style electronic 4x4 actuator which I have determined is in good working condition. I pulled the actuator from the housing and watched it engage and disengage when shifted. Where should I go from here?