i see where a vacuum line comes off of the actuator but where does this line run to?? the tcase engages then disengages quickly...assuming i dont have enough vacuum

1998 zr-2 4.3

 

Does the actuator disengage or does the transfer case disengage? If it is the actuator you have a vacuum leak somewhere, if the transfer case is disengaging, you have far bigger problems.

To check to see if the transfer case is staying engaged, press the 4hi button, and crawl under the drivers side and grab the front drive shaft, if it turns after you've pressed the 4hi button, you have a problem, but if it won't turn then your t-case is engaging, meaning your problem lies between the t-case and the axle.

 

you can hear it click in and then click out like its tryin to engage but doesnt have enough power to engage it. i know i have a vacuum leak cause i missing a vacuum line that comes off the actuactor.

 

That doesn't answer the question Does the Case disengage or the actuator? The case is shifted by the encoder motor which is electric, not vacuum. The vacuum locks the front axle in. If you have the vacuum leak, pictures may help us determine where the leak is and how to help you fix it

 

the actuator line goes to the vacuum switch on right above the transfer case motor