Transfer case and differential fluid change checklist - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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  #1  
Old 11-18-2008, 11:16 AM
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Transfer case and differential fluid change checklist

Okay I am wanting to tackle my transfer case and differentials this weekend and change out the fluid, almost to 60,000 miles. Wanted to make sure I had everything I need before I break in to it and can't get to the parts store.
Transfer case
1. GM Autotrak- 2 qts
2. Hand pump??

Differentials
1. 75W-90 GM- 3 qts
2. Another hand pump

Any special tools that I will need, besides the standard sockets and drain pan.
Thanks
Nate
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  #2  
Old 11-18-2008, 11:50 AM
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i dont know if on the 2004- the drain plug was removed...
(my 2003 has the drain plug and refill hole).
Some had said that latter models have no drain plug...
So to drain it- the cover has to come off...
If this is the case- I would go to home depot and get some plastic to lay down..... get some of the thicker plastic that they have. it will make cleanup faster- and wont stain your driveway.
Also. You may want to have a razor blade.... when the cover comes off- and you remove the gasket (reusable in my case) youll want to run the razor blade over the differentials mating surface to make sure its clean and smooth.
Then youll also want to clean the gasket and make sure nothing sticks to it.
This way youll get a nice seal. Its been about 20,000 since I did mine- and no leaks at all from the cover...
Youll want to do this to make sure you dont stain the driveway--- or have a hard cleanup...

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Old 11-19-2008, 11:50 AM
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I took a quick peek this morning and it looked like I have a drain plug, so hopefully that will make things a bit cleaner. Thanks for the info and the great write up that makes me feel confident to do this on my own. I am definitely going to open up the pumpkin and see what is going on inside. Ordered my GM oil this morning on ebay for $36 for 3 qts shipped, quite a deal I thought.

One question, is the square opening in the drain and fill plug just opened by a socket extension with no socket?
Thanks
Nate
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  #4  
Old 11-19-2008, 12:03 PM
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Quote:
Originally Posted by nateb21 View Post
One question, is the square opening in the drain and fill plug just opened by a socket extension with no socket?
Yes, a 3/8 inch ratchet or extension is what you need.

You might also want to check out the posts in this thread:

http://forums.trailvoy.com/showthread.php?t=45577
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Old 11-19-2008, 12:08 PM
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yup.. thats what you need...
Though I suggest You put some force into it and make sure it doesnt slip out of the little square.
Its not deep enough for the extension to fit in tight- so if youre not careful it will slip out as you apply torque....
wouldnt want to round the edges of the little square...
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Old 11-19-2008, 12:24 PM
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on my writeup for the rear end---hopefully you printed it out--
When I uploaded the pics for the how to on the gas tank--- I had to remove the pics for the differential- since I was low in disk space.
It seems lots of people have been looking at the how to for the thermostat and gas tank- since I just got email saying im at 75% of traffic- once I reach my monthly allotment--- the pics will dissapear until the 1st.
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  #7  
Old 11-19-2008, 01:38 PM
WOOLUF1952 WOOLUF1952 is offline
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sort of. This is something I have not seen addressed.(Sorry if I missed it.) I have about 36k miles. No problems or other worldly noises from the rear diff. Is there any reason to pull the cover when changing fluid?
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Old 11-19-2008, 02:35 PM
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Nope. Absolutely no reason, unless you don't have a drain plug. IMHO.

You didn't ask, but I would say there is absolutely no reason to be changing diff fluid at 36k. If it was 136k, that would be different. Check your manual for the recommended change interval. I'm betting it doesn't say 36k.
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  #9  
Old 11-19-2008, 03:15 PM
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yeah, if you have the drain plug- no reason to take the cover off.
just drain and refill.
But- if its already drained--- and youre curious to see if theres any large chunks of metal at the bottom- removing it will only take a few more minutes.
the gasket is reusable.
I changed mine after 100,000 and was curious to see...
I found no chunks of anything... actually only found very fine particles....
but nothing to be concerned about.
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  #10  
Old 11-20-2008, 01:19 AM
WOOLUF1952 WOOLUF1952 is offline
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Thanks for the responses. I probably shouldn't have added my mileage. I wasn't planning to change the diff. fluids yet. Just getting info for the future. I do plan on changing the transfer case fluid now. I hope to get rid of the studder/shudder when in 4WAuto. I'm going with the GM Auto-Trak II
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