Ralph Connor: Greetings. I have a GMC Envoy 2003... When I turn the switch to 4WD it goes
for about 1 or 2 minutes (enough to get out of a bind) but soon after that
the whole vehicle begins to seize and won't move forward. Soon after that
the 4WD service light comes on and I am forced to switch back to 2WD in
order to continue driving. Now I have no idea where to start, but it would
be nice to have a head start... does that sound like the Front Axle
disconnect to you? Thanks
bob good: Gonna do this tomorrow night. Thanks for the video. Don't know how I made
it through 50 years of wrenching without youtube.
danielgr101: I have a 2002 Trailblazer with this problem I think. Already replaced the
actuator and no change (front axle won't engage when selecting 4WD). When I
had the actuator out, I pushed the plunger in that the actuator pushes
against and had to push it all the way in for the front axles to engage, if
I backed off any, the axles would disengage. The actuator didn't fix the
problem, does this mean the intermit housing has to be replaced? The
actuator does activate when selecting 4WD, just front axles don't engage.
Thanks for any advise you can provide.
Saul Zermeno: Hi, I just replaced the drivers side front wheel driveshaft. I noticed that
some oil came out when I pulled out the driveshaft, where should I add oil?
BenJr108: video for front cv axle removal 02 bravada
Nick Stageberg: Thanks for the tip!
Nick Stageberg: I'm not 100% sure, but I imagine the dealer could read whatever codes are
thrown when the AWD service light comes on, and that will tell you what is
Redlinesixtynine: Thanks for the helpful How-to Vid. I'll be attempting this on my Envoy this
Jon Koeniguer: hello nick. my name is jon and i have a 03 trailblazer and i noticed that
the seal up front on the cv axle is bad. is it really hard to do for
someone who has not done it before? Thanks JON
jwoods8: I have the same problem on my GMC Envoy. My mechanic got all the way to the
axel disconnect but said the bolts are impossible to get to without
dropping or shifting the motor. You look as if you did it while only being
jacked up. Could you please help us!
BlackTB: Just a little FYI, not all early model GMT360's have the trans line issue.
Mine is an 02 and they are well out of the way. Good video though!
104snake: You should make a video on how to replace the hub bearing on one of these
778jonk: Thanks for the vid. I fixed the rattling problem by replacing the sway bar
end links. I have to change out the cv seals now so this was very helpful
Nick Stageberg: I believe there is a bearing inside of the driver's side of the diff that
can fail and cause that chatter, I'm not completely sure. It is a sealed
diff and cannot be repaired. I actually had the exact same problem, bad
chatter from the front diff. I tore down the front disconnect on the
passenger side and it had no problems. I pulled the driver's side axle and
put it back together and it was fine. I eventually just sold it like that,
pretty sure I needed to put a new diff in it. $ :(
Nick Stageberg: Thanks and good luck!
Nick Stageberg: Unfortunately I feel the same way. GM's full size 4x4 platform is great,
but this midsize platform was poorly engineered and seems to have had a lot
of reliability problems.
Nick Stageberg: The dealer is able to scan for codes present that turn on the 4wd service
light. I do not know of a way to pull those codes yourself unfortunately :(
Nick Stageberg: It is absolutely possible to access the bolts with the motor in place.
Larry59lew: your video is very good, but how do u loosen the disconnect assy from the
oil pan. Mine is stuck on real good. I have pried and beat on it lightly to
try and dislodge it, to no avail.Any suggestions u may have would be
greatly appreciated. I am trying to remove the oil pan on a 2004, gmc,
Nick Stageberg: Unfortunately my first guess would be the different gears are wearing. I'm
assuming it only makes the noise in 4wd mode? How many miles on your
bravada? Do you run in 4wd often?
TubeRadiosRule: Wish I had known about this video a coupe weeks ago. The front differential
blew up on my 2004 Rainier and I had a pickleens of a time disconnecting the
passenger side axle. I ended up having to simply unbolt the bearing/connect
from the oil pan and removing it and the outer axle shaft together. I'll
never willingly own another vehicle in this series - too expensive to have
someone fix it for me, and too much of a P.I.T.A. to fix myself. I miss my
1973 IHC Scout II...:(
Nick Stageberg: Oh I wouldn't say it's too bad, this video illustrates the steps involved
in removing the cv shaft. It does take a lot of force to finally get it out
once you have all the suspension components loosened up. Replacing the boot
once you have it off is usually very easy.
Nick Stageberg: Yes, the link in the description has the GM part number for all of the
internal components of the disconnect. You may also be able to find a
disconnect assembly at a salvage yard for a reasonable price.
Nick Stageberg: @IB4rmHouston Hah that is pretty much the best thing you can hope for!
Nick Stageberg: Could be lots of things, your front diff, the disconnect, front drive
shaft, or an axle. Have you checked the fuel in your front diff?
Nick Stageberg: @Larry59lew Do you still have the axle in the disconnect? For me that was
very challenging, and I wedged a chisel between the axle and the
disconnect. The disconnect itself came out very easily once the axle was
removed, I just had to pull the three bolts. If yours is not coming out
easy I suspect there might be some internal damage in the unit that is
seizing on the intermediate shaft.
yakdriver12: My 2004 Bravada symptom is a "whine" that sounds a lot like snow tires on
bare road. Definintly not tires, though. A fluid change (special GM fluid)
in the front dif made it quieter for a short time, but getting worse. Any
ideas from what you saw on your project? Sounds more like a gear noise than
bearing, but I really don't know what's inside that differential case.
yakdriver12: The 2004 Bravada is full-time AWD. So I'm not sure if the answer is "all
the time 4wd" or "when the computer tells it to". It makes noise whenever I
drive above 20mph or so. Mileage is 106,000. I initially thought that the
wrong fluid had been put in during a service, but it drained out and looked
like the blue fluid GM dictates for that part. Yes, it does sound like
gears. I wasn't sure what gears were in the differential. I take it the dif
looks like a normal bevel gear arrangement?
Nick Stageberg: Great, glad you found it helpful!
Jean Agosto: i have a 2002 trailblazer ext that during the winder i use 4x4 when its
snowing and need to get out of something, however usually i run it in 2x4.
i am doing a front suspection replacement and wanted to take a look at the
spindle disconnect or replace it if its worn..any how to videos on that?
Jeff Plomb: looked like the noise was the brakes rotor looks scored on half of the
surface. im having problems getting diffs off oil pan as we are doing an
engine swap, from a trailblazer to a bravada!!
ironworkerlu27: yes i have a 05 ls trailblazer 4.2 and mine is A4WD AND IT HAS 4HI & 4LO
AND MINE ALSO HAS THE ELCTRIC ACTUATOR ON IT AND U SAID THIS MODEL WOULDNOT
HAVE IT MY HOUSING WAS DAMAGES AND SEIZED THERE HAD BEEN A METAL RING FROM
INSIDE COME LOOSE AND SUMHOW WEDGED INTO THE WAY OF MY 4WD ENGAING BUT THE
BACK WAS IN ALL SETTINGS. SO THERFOR EVERYTHING INSID THE ROUND SLEEVE IN
THE HOUSING IS ALL DAMAGED. CAN I JUST BUY A KNEW SLEEVE ? OR DO I HAVE TO
BUY THE WHOLE HOSING? CAN IT BE SMOOTHED OUT TOO?
Eric Wheeler: Nick, Was wondering if you ever did a video for the driver side of the
Rainier, I browesed but did not see it. Also, maybe you can help shine a
little light on my issue. Mine has a hum like a wheel bearing. I jacked up
front and rear and put the car in gear and the front diff made a nasty
chatter. I started taking things apart to get the diff out. I pulled out
the driver side CV axle and noise went away, but nothing appears wrong with
the spline on the axle or the gear that it slips into.
IB4rmHouston: i had some rattling and grinding i thought was the cv as well coming from
the front diver side. But it ended up being the heat shield had lost a nut
and was hanging down and rubbing on the front drive shaft...
Nick Stageberg: Yes you can, and ultimately that is exactly what I did with mine. The
driver's side axle is what was causing strange noises, I left the passenger
side axle in place as the disconnect on my vehicle seemed okay and it was
not making any noise.
Nick Stageberg: Thanks, glad to hear!
Nick Stageberg: The front axle disconnect is on the passenger side, and the diff is on the
driver's side, the noise is almost certainly coming from one of those two.
You can get these remote controlled magnetic microphones that can make
tracting down those noises a million times easier.
colton barless: i have an 03 envoy and my differential is shot. is it possible to take out
the front axles like you did in the video and then re assemble and just run
the vehicle with rear wheel drive?
bryon clemons: I have a 04 raininer awd on demand, it does not engage, used the scan tool
and it reads all the speed sensors correctly but if I get into sand and get
the rear wheels to spin after awile the awd service light comes on. what
could the problem be the encoder motor ? there is no noises or any unusual
noises. any ideas? thanks BRYON C
ironworkerlu27: yeah i didnt know if you could rebuild the disconnect or not!! can you buy
all the replacement parts to resleeve the entire insid? that would be sweet
becuz i just found out its about $500 bucks just for the disconnect and an
additional like 40 bucks with the electric actuator@obst41
Nick Stageberg: The front diff on the that platform is extremely involved, I know it
includes removing the engine oil pan. I would not put the job at less than
Agustin Posas: im have problem 2004 trail blazers 4wd is noises when active 4wd
Doug Moff: I have a 04 reinier and i got stuck in mud and the light for awd came on
and the front wheels never spun in the mud, how can i check the awd to see
if it is working?
Nick Stageberg: This and an oil change video are the only how-to's I have on this platform
gowherethewindblows: Do you have any videos on removal of a diff on a 2004 chev trailblazer? I
hear its like a 5 to 6 hr job?
Nick Stageberg: The automatic 4wd on the bravada only engages in limited traction
situations, it does not run all the time. If you are hearing a noise when
you are in 2wd mode that is encouraging, it could be an issue with the
front axle disconnect, which is just cheaper and easier to service than the
differential. You really need to try to localize the noise if it all
possible, I know it can be difficult.
Nick Stageberg: I have a very popular video on replacing the wheel hub/bearing on the GM
fullsize platform (silverado, yukon, etc), I imagine the mid size platform
Nick Stageberg: @MrDefenestrate Ah thanks for the note!
331sbf: I use a flat wide Stanley pry bar to pop the CV out that I got from Walmart
Nick Stageberg: Yikes! First you will have that actuator if you have a manual selection
switch, which you do, and this Rainier does not. As for fixing that issue,
I think I would have to suggest replacing the entire unit. However, in the
video description I have a link to a walkthrough for rebuilding the
disconnect unit. If you run through that you may be able to replae only
some of the parts. Good luck! And if you find this helpful please