okay so i went to the beach and went to go into 4 wheel drive, the light for 4x4 switch would light up BUT ONLY BLINK TO 4lo or 4hi and if i repushed 2wd it engage and hold and go back fine, now you can hear the 4x4 switch cuz you hear it go Choo into 4 wheel low then Choo into 4 wheel high, but wont stop blinking and wont engage fully into 4wheel drive, can anyone help me my vehicle is a 99 chevy tahoe 5.7 LT

 

so after doing alot of research and not getting any reply hoping someone ran into this problem also, i have found alot of 1999 chevy tahoe 4x4 front actuators from 60 bucks to 120 bucks, now i dont know if theres two actuators, but can anyone point me in the right direction on where to look? is there two actuators or another one on the t-case? just looking for some reliable info here

 

my expedition used to do the opposite. it would go into 4 but wouldnt go back to 2. i think it was the transfer case sticking but not positive

 

Slow/reluctant transfers occur frequently, mainly because of old Fluid, and shellac in the Case making the transfer (at least) sluggish from infrequent use.

Here's a procedure you can try to get it to change...

Place Transmission in 4WD-Hi.
Accelerate Vehicle to just over 5 MPH.
Shift to Neutral Gear while moving.
As forward motion drops just below 5 MPH, Press 4WD-Lo button.
Transfer to Lo should take place within 10-20 seconds.

In some instances, it may be necessary to use the "rolling" procedure to initially transfer into 4WD-Hi
You many hear a respectable "clunk" upon transfer. (that's normal Chevy )
This procedure may be used to transfer from Hi to Lo, or, Lo to Hi.
You may have to try this several times, to get a really sluggish Case to transfer.
This procedure should be done on Pavement or Hard Dirt, to allow the Vehicle to roll for a sufficient length of time to shift.

Fluid Changes for the Transfer Case should be every 25K miles for severe use, and every 50K miles for normal use.
Exercising the 4WD-Lo function, should be performed at least once per Month, and driven at least 1 mile in 4WD-Lo to allow Lubrication to circulate.
Use AutoTrak II (or equivalent) for Fluid Changes (about 2 qts)
IF there are instances where the Case will not transfer, it is recommended that a Fluid Change be tried before major repair is initiated. Frequently this is all that is needed to re-establish usage.

 

so yesterday i wiped down my axel housing, or differential whatever you wanna call it, and i cleaned around the 4x4 actuator in the housing and played with the clip and today the 4x4 works went right into 4lo and 4hi and 2wd perfectly, i was happy, maybe it need some connection love lol but i know im gonna get back under there clean it alil better and put reclean the connector this weekend when i can put the car up

 

glad to hear it was easy and cheap fix

 

I just swapped out my transmission and all seems okay except when I swapped the transmission I'm almost sure it was in 4wd before I dropped it and put the new tyranny in and now it won't come out of 4 by 4. I've been through at least 11 transmissions and I don't know what to do