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2004 Trailblazer LS 4x4, 4.2L:, 2016 ATS-V, 2014 CTS-V Wagon, 2018 Audi A7
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Discussion Starter · #1 · (Edited)
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Under my 2004 TB, 4 wheel drive, 4.2 automatic with under 100,000 miles - the right hand side 'appears' to be leaking.

First, can I drive this truck in 2 wheel high? Probably not, but you all definitely know more than me so I would appreciate your input.

Second, what might be my best plan of attack to repair this? I will have to pay a mechanic as this is out of my league. A junkyard part is probably out of the question as my truck is located 10 miles from a local mechanic here in the country or 45 minutes from the city. The country (good but very busy) mechanic is reasonable and decent, so I lean towards having his company do any work.

Any and all input is welcome. Thank you!

Edit: Upon further review it appears my power steering fluid is low. I remove the PS dipstick to see the level on the lowest notch. What is the best fluid to use in the PS pump? Once I fill that I will let my truck rest and re-check fluid levels in a week.
 

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'05 Chevy TB EXT
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5,130 Posts
Put as few drops of fluorescent troubleshooting dye into that PS reservoir before you make this decision.

Make sure that what you think is leaking --- really is the culprit.
 

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2004 Trailblazer LS 4x4, 4.2L:, 2016 ATS-V, 2014 CTS-V Wagon, 2018 Audi A7
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204 Posts
Discussion Starter · #4 ·
I will do some additional exploration tomorrow. I am going to wipe things clean and take a follow up look 24 hours later.

If it is my front differential leaking then I probably shouldn't drive it, correct?
 

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2004 chevy trailblazer_ls_ext
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693 Posts
If you don't mind having a 2WD truck you can just pull the CV axles. The front driveshaft will not rotate unless the selector switch is in 4HI or 4LO. That should isolate the front diff. You can pull the front driveshaft as well if it makes you feel more confident.
 

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'05 Chevy TB EXT
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The dye is available at a decent parts house --- maybe NAPA as they tend to cater more to the professionals.

If you wanna chase oil leaks - there's nothing like actually knowing what's leaking before you dive in.
 

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2007 chevy trailblazer_lt
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1 Posts
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Under my 2004 TB, 4 wheel drive, 4.2 automatic with under 100,000 miles - the right hand side 'appears' to be leaking.

First, can I drive this truck in 2 wheel high? Probably not, but you all definitely know more than me so I would appreciate your input.

Second, what might be my best plan of attack to repair this? I will have to pay a mechanic as this is out of my league. A junkyard part is probably out of the question as my truck is located 10 miles from a local mechanic here in the country or 45 minutes from the city. The country (good but very busy) mechanic is reasonable and decent, so I lean towards having his company do any work.

Any and all input is welcome. Thank you!

Edit: Upon further review it appears my power steering fluid is low. I remove the PS dipstick to see the level on the lowest notch. What is the best fluid to use in the PS pump? Once I fill that I will let my truck rest and re-check fluid levels in a week.
I just did the maintenance on the whole drivetrain for my 2007 4.2 4x4. I’m noticing that your leaking fluid appears red. The gear oil in the front and rear diff are probably black (if you haven’t changed them in a while). Transfer case fluid is blue (green if it’s dirty). Your leak could be ATX fluid, which is red, but I doubt differential or transfer case.
Start my putting some dye in when you top off the PS reservoir and go from there. Make sure you check your ATX level while you’re at it.
 

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2003 chevy trailblazer_ltz
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629 Posts
1. My Trailblazer whined like a misbehaving two-year-old until I flushed the old PS fluid and installed Genuine GM "Cold Climate" PS fluid. If whining isn't a problem, regular plain ol' PS fluid is fine. Available from GM, or from every parts store in North America.

2. Pull the fill plug on the front differential. If it leaks, it's low. They don't hold much, so it doesn't take much of a leak to run it dry. Dry bearings and gears don't last long when you use 4WD. I spent about two years dicking with my front differential because I was too lazy to replace the right-side seal. Every 300 miles, I had to pump more 75W-90 synthetic fluid into it. DO NOT let it run dry.

3. If the differential fluid is still reasonably full...the leak is from somewhere else.
 
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2004 Trailblazer LS 4.20 L
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thats not from your differential. power steering lines are known to rust out. someone probably put leak stop in the ps and that stuff is redish. your front diff fluid is going to be a medium brown yuck color and low if you havent ever changed it or added any and you use 4wd to play with your boat trailer.
 

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2003 Chevy Trailblazer LT
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606 Posts
thats not from your differential. power steering lines are known to rust out. someone probably put leak stop in the ps and that stuff is redish. your front diff fluid is going to be a medium brown yuck color and low if you havent ever changed it or added any and you use 4wd to play with your boat trailer.
Yea mine blew a few weeks ago. Wish I had them looked at before they went.
 
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