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2006 chevy trailblazer_ls
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Discussion Starter #1 (Edited)
After a road trip, the next morning saw a small puddle, 3" maybe, under the car. Pulled it into the garage and climbed under it, and saw the attached picture. Hard to tell where the fluid is coming from, possibly the output shaft for the front wheel drive? Anybody else had problems similar to this, have seen a couple of thread on this, so another question is, if it is a plugged vent line how do I check it and where does the end of the vent line run to, I found where it connects to the transfer case just above the read output shaft. Appreciate any help since this is my first post.

 

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2002 chevy trailblazer_ltz
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912 Posts
I'm going to say that is transmission fluid that is leaking somewhere and running down to the transfercase because it sits lower than the transmission. Transfer case fluid is blueish-green and transmission fluid is red. Someone with more experience will chime in here soon. Just check the level of the transmission when it is warm to make sure you are not low.
 

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2009 chevy
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I'm going to say that is transmission fluid that is leaking somewhere and running down to the transfercase because it sits lower than the transmission. Transfer case fluid is blueish-green and transmission fluid is red. .
Yep, you got it Jacob
 

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2005 chevy trailblazer_ls
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10 Posts
Just experienced the exact same symptoms on my 2005... The dealership's diagnosis didn't sound too friendly on the wallet.

I ended up dropping the pan, replacing the filter and 5 quarts with ATF VI... and also replacing an 8 inch section on the trans cooler lines with a rubber transmission hose. It seems moisture gets introduced into the system somewhere because the transmission dipstick was also rusting towards the top-

Not sure how much more life if any this will breath into the trans but it's worth a shot at least-
 

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2004 chevy trailblazer_lt
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10 Posts
Hello, new to the forum. Just signed up due to my first problem with my 2004 Trailblazer. I have the exact same symptoms as edogwv. My tranny is wet with transmission(not transfer case) fluid and my dipstick was rusty about a third of the way down. I'm also clunking when sitting and shifting gears and also when slowing to a stop. Sounds internal in the transfer case actually. I have no transmission experience at all so hopefully someone has had the same problems and has some input. Any help for the newbie and others would be greatly appreciated!! Leaving for vaca. in a week!
 

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2004 gmc
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26,181 Posts
Does your transfer case go through all the modes as expected? There was a weak internal bearing carrier design that used to break for folks who overused the A4WD mode. But the tranny issue sounds like you need a local specialist ASAP.
 

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2004 chevy trailblazer_lt
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10 Posts
Thanks for the input Roadie. I do have full function of all modes but I wonder if something may be on the way out. This is actually the wife's and she loves using that darn auto 4wd! Since my post I did read a bunch of posts about overheating causing the vent to overflow. Thats where the oil is from. It doesn't explain my noise but when I tried it a couple hours ago cold I couldn't repeat the symptoms. Gonna look at it again today when I wake up from night shift and try to repeat the noise. I also believe it was you who posted about the shaft bind that can be fixed with lube or a nickel coated slip ring??(forget part name) replacement. Haven't looked at this yet but sounds like it could be the noise source as well. I have to see how the shafts are removed so I can check this out. Thanks again!
 

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2004 chevy trailblazer_lt
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Alchemist, let me know if I stole your thread for nothing, hopefully the problems I'm having are going to help you too or better yet your problem is fixed by now! Anyway, narrowed clunking down to transfer case only after driving truck for a while. The clunking is the worst when sitting and going back and forth between rev&drive. Also pretty much play in rear output shaft, but this may be normal (rookie). I would say the TC is going, but why does it only act up when hot??? Any further input much appreciated.
 

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2004 chevy trailblazer_lt
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I have verified now that the TC needs to be replaced. I checked some fluid out of the drain and it is filled with metallic particle. Somethings coming apart in there! I may do a swap myself. Does anyone have a material list readily available for everything I would need to do complete swap. Only thing not obvious to me yet is how the front and rear output shafts connect and if the boots are reuseable. Any help would be GREATLY appreciated. I have three days to buy everything and do the install this week and I don't think a shop will get me in that fast!
 

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2004 gmc
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26,181 Posts
www.compnine.com has exploded parts diagrams from GM, but seriously, nobody buys parts and rebuilds these things unless you have a lot of time and have figured out it's just one small part. Ebay or www.car-parts.com for a junkyard/recycled unit. I seem to remember members here posting about quick swap-outs, like an hour or two.

I see transfer case rebuild kits on Ebay now for $260 or so, but they don't include the clutches, and they wouldn't include the bearing support that got redesigned. Best bet is to get a TC from 2005-2006+.

Drive shafts typically come out by disconnecting them at a U-joint, then sliding apart the splined slip coupling. Buy the Haynes manual for a bit of assistance.
 

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2004 chevy trailblazer_lt
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10 Posts
Roadie, thank you once again! You've been a great help. I figured the shafts just slipped out once the universal was unbolted. Thanks for verifying. I am going to pick up a new or used unit and swap if I can't get an appointment this week. For parts I just meant the TC to tranny gasket, etc. that I would need, nothing internal for a rebuild.
 

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2004 olds bravada
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39 Posts
another red.....

Hi guys,

Just chiming in to say that my transfer case was full of RED fluid also. I had some warranty work done in 2008 and i assume they filled it with the 'old' stuff and not the Trak II. <-- thats what i was swapping out when i noticed the straight red fluid.

Initially i was worried about a seal leak and fluid transferring from the tranny into the transfer case, but i checked the tranny level and all is good. There was absolutely no signs of leaks anywhere either.

I'm guessing the noob at the GM dealership just didnt put the good stuff in!

-Mark
 

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2004 chevy trailblazer_lt
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Hi guys,

Just chiming in to say that my transfer case was full of RED fluid also. I had some warranty work done in 2008 and i assume they filled it with the 'old' stuff and not the Trak II. <-- thats what i was swapping out when i noticed the straight red fluid.

Initially i was worried about a seal leak and fluid transferring from the tranny into the transfer case, but i checked the tranny level and all is good. There was absolutely no signs of leaks anywhere either.

I'm guessing the noob at the GM dealership just didnt put the good stuff in!

-Mark
Some one can correct me on this but i think we HAVE to use the blue fluid in our TC. IF you dont it can cause problems with the clutches inside the transfecase
 

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2004 chevy trailblazer_lt
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Just to clarify in my case guys, I had the blue Autotrack II in my case but thats only because last year I corrected the dealership when they wanted to sell me normal ATF for the change!!!
I did swap out my TC yesterday with a $300 used one w/ a warranty from my local scrap yard(that was pulled ready to go). My problem with the binding/clunking is all better now. I attribute the red fluid to my trans vent that terminates over the top of the TC. I ran the truck towing a small boat in hot weather a couple weeks ago and parked it in the sun at the marina after a two hour tow. Maybe that along with a struggling TC overheated the tranny?? Hasn't done it since but I'm still gonna do a fluid/filter change after vaca next week.
Thanks again for all the newbie help on here!!
Now time for a new post and search for why the darn dash vents aren't blowing, only the floor and defrost work!!! OH WELL!
(Did I meantion in earlier posts that I have car trouble three years running exactly two days after taking truck to stealership for annual inspection??)
 

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2004 olds bravada
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From what i remember, the 'new' TRAK II was a replacement for the red stuff.
I'm guessing (in my case) the morons just used the old stuff instead of the new Blue. It's all good now. I changed it out and will run about 1K miles on it, then change it again to get every drop of red out.

YANNY:

Read this post http://forums.trailvoy.com/showthread.php?t=75435
It will fix your no AC from vents and is very informative.
I JUST fixed mine about 2 weeks ago. Order it from www.rockauto.com

-Mark
 

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2004 chevy trailblazer_lt
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Mark, thanx for the link. I did verify that the actuator was bad so I moved the vent to the dash and unplugged the actuator until I order a new one. Hopefully this is it for a while!
 
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