Good video. The tip about loosening the fill before the drain sounds and is obvious but in the moment I'd definitely just open the lower of the two without thinking about verifying that the fill wasn't seized. Smart tip 🤓👍 And the pump looks like something I can make with a conditioner bottle, again a nice money saving tip 👍
Better to use allen sockets that way you use a ratchet on those plugs. Most transfer cases never ever are serviced.....ive owned many many 4x4s....not a one i know has ever been serviced. Good thing you point out the auto trak II fluid....a must on the auto transfer cases.
I agree with allen sockets, they will offer more precise control and not round out the plug. The Trailblazer 226 auto xfer case should have a fluid change every 50K miles. I also prefer to get a third quart because my hand vacuum pump will not get all the fluid at the bottom. Once the level fill hole seeps, then I know it is full. Do not overfill.
I feel my TB transfer case maybe dry. The last time I used it (maybe 8 yrs) I heard a loud noise underneathe my driver seat. Being afraid to try it fearing damage
The transfer case is directly under driver's seat - so it is likely the transfer case is where the loud noise came from which is not good. These transfer cases are known to have internal bearing/fork failures. We recommend having a professional look at it. The internal bearing/fork failure can actually put a hole in the case which would result in a dry transfer case (metal gears grinding on metal gears) as all the fluid would leak out. We recommend only engaging 4WD when the car is at a complete stop (even though GM says you can change it while accelerating) with the wheels COMPLETELY STRAIGHT, not turned. Never make sharp turns in 4WD as the front end can bind up damaging both the front end and transfer case.
I will emphasize that it is now n your best interest to change to be in 2 hi, 4 low, and 4 hi. And change it at a complete stop. Don't drive it then turn the switch. The front disconnects don't exactly mesh so after slowly backing up or forward it will then be in 4wd. The front disconnect has an aluminum fork and can easily be broken while driving then switching to 4wd. Also you should have the front disconnect inspected in my book once a year. This helps catch any problems with grease drying out or bearings replaced. But you should be okay every other year. Just have it inspected once in a while. They can be pricey to replace if not caught in time
Man who's your Fluid guy? Amazon has Autotrak 2 for 11 bucks a bottle. I also don't remember it being allen headed, I seam to recall it being just a 3/8ths drive ratchet for the plugs, but it has been 6-9 years since I did this last.
I am gm master tech I got 2006 trailblazer its got 353,000 miles ish I bought it new its on third set of timing chains second transmission rebuild and transfer case has been on auto from day one only settings I use are auto and low I change the fluid every 60k its never been open
No offense to your 4WD.. But I own a rainier which is the exact same thing but it's AWD and I used to own an envoy and in the winter time I don't get stuck even once with the Rainier but I used to get stuck all the time with the envoy.
If you're getting stuck with the 4WD on the Envoy good chance it was your tires or you didn't have the G80 locker. The locking rear differential actually makes a bigger difference than the 4WD in that scenario. The AWD does corner better than the 4WD for sure. Thanks for the input!
GM manual calls for only Auto-Trak II Transfer Case Fluid. Mechanics also used Automatic Transmission fluid for Power Steering - another thing not to do. Seals are made of different materials than 30 years ago. Use what the manual states. Jiffy Lube probably had much cheaper options - I wouldn't expect them t use anything ACDelco.
This would be correct. The manual specifically states to use acdelco trak 2 fluid do to the friction material added. This helps the transfer case from wearing out faster.
Good video. The tip about loosening the fill before the drain sounds and is obvious but in the moment I'd definitely just open the lower of the two without thinking about verifying that the fill wasn't seized. Smart tip 🤓👍
And the pump looks like something I can make with a conditioner bottle, again a nice money saving tip 👍
That's funny what you say about all wheel Dr only on cars. My envoy has a selection for all wheel drive, two wheel drive, four hi and four lo
2hi = 2wd high range
A4wd = automatic 4wd
4hi = 4wd high range
4lo = 4wd low range
N = neutral
That’s on my 2005 gmc envoy
Out here doing it yourself. We need more or that. Bravo
Better to use allen sockets that way you use a ratchet on those plugs. Most transfer cases never ever are serviced.....ive owned many many 4x4s....not a one i know has ever been serviced. Good thing you point out the auto trak II fluid....a must on the auto transfer cases.
I agree with allen sockets, they will offer more precise control and not round out the plug. The Trailblazer 226 auto xfer case should have a fluid change every 50K miles. I also prefer to get a third quart because my hand vacuum pump will not get all the fluid at the bottom. Once the level fill hole seeps, then I know it is full. Do not overfill.
You rock - never knew of those dispenser pump dealies - with a hose. You never mention that in the part list? I'll check thanks "Quart Pump" AH!!
Thanks for the video. I was able to change the fluid no problem!
Ha! We saw you take a bath in the oil!😂. Joking aside, good vid!
Video is very helpful I Ned to do the same to my 2002 gmc envoy 4 wheel drive
Is it the same on a 2003 GMC envoy? Thanks
Also could the transmission filter being clogged stop the transmission from shifting when the fluid gets warm or hot?
I used amsoil pouches they work great
Why did you reuse the old rusted wore out plugs?
I feel my TB transfer case maybe dry. The last time I used it (maybe 8 yrs) I heard a loud noise underneathe my driver seat. Being afraid to try it fearing damage
The transfer case is directly under driver's seat - so it is likely the transfer case is where the loud noise came from which is not good. These transfer cases are known to have internal bearing/fork failures. We recommend having a professional look at it. The internal bearing/fork failure can actually put a hole in the case which would result in a dry transfer case (metal gears grinding on metal gears) as all the fluid would leak out. We recommend only engaging 4WD when the car is at a complete stop (even though GM says you can change it while accelerating) with the wheels COMPLETELY STRAIGHT, not turned. Never make sharp turns in 4WD as the front end can bind up damaging both the front end and transfer case.
If it was dry 2wd would also stop working
I will emphasize that it is now n your best interest to change to be in 2 hi, 4 low, and 4 hi. And change it at a complete stop. Don't drive it then turn the switch. The front disconnects don't exactly mesh so after slowly backing up or forward it will then be in 4wd. The front disconnect has an aluminum fork and can easily be broken while driving then switching to 4wd. Also you should have the front disconnect inspected in my book once a year. This helps catch any problems with grease drying out or bearings replaced. But you should be okay every other year. Just have it inspected once in a while. They can be pricey to replace if not caught in time
Man who's your Fluid guy? Amazon has Autotrak 2 for 11 bucks a bottle.
I also don't remember it being allen headed, I seam to recall it being just a 3/8ths drive ratchet for the plugs, but it has been 6-9 years since I did this last.
I am gm master tech I got 2006 trailblazer its got 353,000 miles ish I bought it new its on third set of timing chains second transmission rebuild and transfer case has been on auto from day one only settings I use are auto and low I change the fluid every 60k its never been open
That's because 2005 models were the most affected. www.trailvoy.com/threads/transfer-case-internal-failure.47545/
What year is your envoy? I have a 2003 model and I need to change the fluid as well
I can see your plate number when you drive down the road. Also if someone wanted to find our address it's a simple Google search away
Good video, right to the point.
Thanks, Jason!
No offense to your 4WD.. But I own a rainier which is the exact same thing but it's AWD and I used to own an envoy and in the winter time I don't get stuck even once with the Rainier but I used to get stuck all the time with the envoy.
If you're getting stuck with the 4WD on the Envoy good chance it was your tires or you didn't have the G80 locker. The locking rear differential actually makes a bigger difference than the 4WD in that scenario. The AWD does corner better than the 4WD for sure. Thanks for the input!
Wow, blue transfer case you didn't. I worked at Jiffy Lube twice and usually only used ATF+4, Dexron III Mercon IV, GL 5, 75w90, 80w90, and 75w140.
GM manual calls for only Auto-Trak II Transfer Case Fluid. Mechanics also used Automatic Transmission fluid for Power Steering - another thing not to do. Seals are made of different materials than 30 years ago. Use what the manual states. Jiffy Lube probably had much cheaper options - I wouldn't expect them t use anything ACDelco.
This would be correct. The manual specifically states to use acdelco trak 2 fluid do to the friction material added. This helps the transfer case from wearing out faster.
And this why you don't go to jiffy lube
to think of all the avoidable repairs you caused people to have to do because their parts failed due to the wrong fluid.