Yukon front wheels bind in awd

so what are the symptoms.?????????????????
what transmission, A/T or M/T?
you get on the dirt. and shift to 4Hi or 4low (its not for DRY pavement) so... AWD started in 2004, so is not AWD. but PT.
called Part time four wheel drive.
are you getting ready for snow , that it? do say so, as telling the job puts us on the same page...

and 4wd does not engage?
this system is just Part time 4wd,. and is for ice roads or dirt only.
the first test is the transfer case not front axle.
test 1:
when you select 4HI the gear dogs in the transfer case lock.
and not power goes to the front prop shaft,
with all 4 wheels on jack stands this can be felt key off.
or running in 4wd.
key off , and A/T in PARK or 5speed stick in say REVERSE
you can not turn the front prop shaft by hand, in 4H wheels off ground, that means the transfer case is in fact in 4hi.
Ok we now have POWER To the front axle. (following me;/??)
so the front axle locks.
if the front , fails to lock, up, at spec pressure then the part 18 is bad (spec is 4.25 PSI)exactly.
http://www.fixkick.com/axles/04lock.JPG
if on the other hand the pressure is low, then this is bad
part 25 pump i s bad.

http://www.fixkick.com/hubs/F-axle-99up.JPG


easy huh>?

or is the only symptoms just the dash light.
as driving on pavement dry, (no ice) its normal for the dash light to fail. after all you dont belong in 4wd now. lacking ice or dirt.
but if you jack car up in air, sure the light must come one.
the light dont come on until the transfer case fully engages.
and cant if on dry ground and it binds up, as ALL DO.
get on dirt.
shift to 4wd, going dead slow, 1/2"mph slowest possible speed.
this saves DOG DAMAGE. in the box.

http://www.fixkick.com/part-time-test.html#Suzuki_PT


no,sorry, the PCM has Zero to do with the manual transfer case.
please say , what fails (besides the useless dash light)
what are you doing?
where is car, what surface are the tires touching?>???
do not drive this car on dry pavement (means no ice)
in PT 4wd.
its not for that. sell car buy 2004 with AWD.
if you know all that, as the operators guide says.
then do the prop shaft test .wheels off ground.
and say what transmission you got here,
i have 4 cars like this all are 5 speed box.

see the dogs here.
see red arrow. see words weak.?
http://www.fixkick.com/tranny/xfr-case/XFRCASEGUTS.jpg

when you shift to 4H, this dog engages and the chain moves.
and the front prop shaft moves with full power.
that is test one, engage this dog and test.
the dogs are the small teeth on gear #29

easiest way to tell if it is 2 wheel or 4 wheel is look under the car. From the front of the vehicle just off center (could be left or right) there will be a differential. (much like what you see under the rear of a pickup truck. If you see this it's a 4wd or awd. The difference between awd and 4wd is- 4wd is either front or rear wheel drive with the ability to (now days) push a button and "lock in" the other axel. Awd is at all times, all 4 wheels are working together to move the vehicle.

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.

Hi, depending on the vehicle, there can be different controls. Standard control, 4hi, use in slippery conditions, never on dry pavement. Just push the button, and it will engage. 4low is for extreme conditons and the transmission must be in neuteral to engage 4lo. If you have auto 4wd button, just press the button in slippery conditions. If you have a denali, it is all wheel drive, and there are no buttons to push. So, depending on the model, there are multiple ways, but pushing the button engages it. Good luck...Goop

It may be the front axel actuator moter(on front axel right side) is not disengaging the axel. There is a 4wd
fuse 15amp in the fuse block under the dash, make sure it's not blown. If the fuse is ok, check the connections at the actuator and the transfer case switch. These are the more common causes for the
problem you have. Give these tests a try and let me
know if you want to go to the next level.
Hope this helps. Good luck.

fullyjr.

Engaging from 2WD - 4HI/Lo requires movement of the vehicle. very low speed under 5mph, push button should engage. the vehicle has to be moving.

i think your anti lock/traction control system will cause this. does you truck have these options?

That depends a lot on how your truck is equipped. GM uses several different 4 wheel systems including AWD, Part-Time 4WD, Full-Time 4WD, and ON-Demand AWD. Then there is another version used on some trucks that is a combination of 4WD and On Demand AWD. - it gets a little confusing but each system as slightly different charachteristics.

Genericly speaking, if you have the push-buttons on your dash that say "4-HI", "4-LO", and "2HI" and/or Auto-4WD , the transfer case has an electronicly-controlled stepper motor which shifts the transfer case into the selected mode. An electric solenoid/actuator then engages/disengages the front differential for 2-Wheel or 4-Wheel modes. One push of the button and it shifts the transfer case and engages the front differential.

That's much easier than the old days when you had to stop the truck, get out (Sometimes in the middle of a big mud hole) and lock the front hubs then get back in and play with the lever in the floor to get the transfer case to shift into the desired mode.

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

if it is a lever type and not automatic 4WD. You have to manually get down and turn the hubs clockwise to engage or couter clockwise to remove from 4WD. then Push the lever to 4L or 4Hi. If it is automatic. You press a button to engage 4wd.