Whole system/slide collor setup is junk!.
Best best which many have done is to replace it with a like year s-series bravada shaft/tube.
This replaces the two piece spilined slide collor setup with a once piece axle shaft.
You will need the shaft/tube from a 98-01 bravada. Some RTV, and time.
Once done your front end will be enguaged all the time. You will NOT need to be rolling forward at all to get it to work. So thats a big plus.
Only mod needed for this is to remove the outter snap ring where your CV would slide onto. And you can either use a cap packed with whatever to tell the sensor shit its in 4x4. Or just remove the sensor and splice the wires together.
Other options are a popnlock manual pull line, or just pull and secure with vise grips if the slide collor is still good that is.
Also make sure you get the updated TC vac switch. When the older ones fail they will suck fluid into the hvac system that leads to the controls hiss of death. You DONT want to have this happen.