When I hit the button for 4wd the lights on the button are fine but the front tires do not turn. The front drive shaft is spinning when it is engaged but the front tires wont engage. Also when I hit the button for 4Lo the light on the button is fine and the rear does kick down to the lower gears, and the fornt drive shaft is still turning but the front tires still do not turn.
Check for a leaking vacuum control block to the front vacuum operated locking hubs
SOURCE: My 98 chevy blazer won't shift into 4wd.
Most common problem is the vacuum diaphragm that is so inconviently mounted UNDER the battery tray.The cable that locks in the front diff is attached to it and vacuum pulls it in/out.
SOURCE: 98 K1500 suburban, can not engage 4wd, HI or Lo runs otherwise
your doing it right but your accuater is bad 59.00 auto zone easy install
SOURCE: 4wd will not engage on 2002 gmc sierra 1500
try going into reverse for 10 feet then go to drive for 10 feet that might help if not it is to the wiring to you 4x4 engage system (wires to your wheel hub)
I’m happy to assist further over the phone at https://www.6ya.com/expert/john_2c7bb9c157d0baa8
SOURCE: 2001 Chevy 4WD button lights don't come on - 4WD wont engage
check the solenoid on the front chunk these vehicles have had a lot of problems with these solenoids. have personally replaced about 10 of these on 98-02 models.
SOURCE: I have a 2001 Chevy 2500 4X4. Four wheel drive not
Sounds like the chain in the transfer case has broke or the linkage is out of adjustment
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