1999 blazer - 4 x 4 is only engaged when I am in the 4 auto. I push 4hi and I loose the front axel. This is also same with the 4 lo.. But as soon as I push the 4 auto/ i get the front axel back again.. ? What is going on.. I replaced the cable actuator behind the battery tray last year.. and thought I solved the problem then.. I have good vaccuum off the solenoid on the fire wall to the actuator behind the battery tray. check for vaccuum leek on the actuator, an negative.. any help??
brad