When i push the 4hi button the light just flashes then goes off. when i push the 4lo button it flashes but then turns soild and u can hear the 4wheel drive click in? i dont hear nothing when i push the 4hi? it just wont go into 4hi?

change your push button switch had same problem

U have problems in the lower part, solenoid.

If its a 4WD there is either a push button on the dash left side of steering colomn, its marked 4hi. If manual shifter in on floor center console. Pull back on lever to second notch marker 4hi. If you are in 4lo now and can't get out. first put tranny shifter in neutral while engine running, then shift transfer case into neutral (manual push forward), push button hold 4hi and 4lo at the same time til "N" green light comes on. Then shift either into 4hi.

the vacuum lines run to the hubs behind the brake rotors on the front wheels

ok what i would try is put the truck in park then try to **** into your 4wheel drive high or low, other than that with the computer thats on board you may just have a technical issue that can be solved at the dealership

must be in neutral to go in 4lo. ther is a valve under the scatter shield under the motor, check that

it is very possible that a wheel speed sensor is open or reading erratic, causing the ECM to override the 4WD switch. Borrow/rent/buy a scanner that will tell you this info,

If they are blinking I believe it means that there are fault codes present in the pcm. You need to get the computer scaned to see if there are an codes present. If you live near an Autozone or Checker autoparts they can scan it for free.

your doing it right but your accuater is bad 59.00 auto zone easy install

vacuum leak or vacuum locker solenoid problem. a great way to check for both is to remove both vacuum lines from the solenoid (located on firewall above destributor), and put a connector between them, push the button on the dash and see if it locks in.