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Discussion Starter #1
It appears as though low differential lube levels on new trucks is a common issue. I'm going to my dealer today to get the fluids topped off or changed (I'm pushing for changed since they've been running low which has worked the lube harder).


Do you think any damage has been done to the rear differential since it has run 1 to 2 qts low for 7000 miles? I have done about 300 miles of towing 3500 lbs. The rest has been unloaded.
 

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The diff holds about a gallon. I don't think 1 qt. low would really hurt it, especially with the synthetic lube and all...

I think I'd worry about 2 qts low though.
 

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After reading everone's posts about about low fluids, I checked all mine last night. Sure enough the rear diff. was low (everything else was OK). Truck is about 2 weeks old and has 850 on the odo. Took it in to the dealer this morning and they topped it off for me to the tune of 2QUARTS! At least they noted it on the work order though, so if I did have any future problems I've got proof it weren't my fault.



JoshEdited by: GMCSLEHD
 

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Discussion Starter #5
I went to the dealer today and they checked the levels finding them low. When they looked at the lube in the rear differential it was gray due to initial wear debris. They offered to drain it and refill free of charge
. In fact, they went ahead and drained and refilled the front differential too.


Now here's the interesting part. When they came to get me when the work was done they said that they put dino lube and limited slip additive in the rear diff. per the service manager. He said that they have been doing this in the Eaton lockers because of problems with using the synthetic
. This was the first I had heard of anyone using dino so I told him I wanted the synthetic "grape juice". They drained the diff. and refilled with "grape juice".


Eric, have you used anything but synthetic in the Eaton lockers?
 

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Started reading several truck forums before I ordered my new truck so I was expecting the differentisals to be low. Sure enough when I took delivery of my 04 2500HD 8.1/A I checked all of the fluid levels. The front diff was so low I could not check the level with my little finger, not could I tell what type of fluid was in it. Was too lazy to drain some out. The rear diff was also low but I could just reach the fluid with my little finger (synthetic). The transfer case was OK.


Took it to the dealer at 423 Mi and asked for the front diff to be drained and refilled with synthetic (grape juice) and the rear diff topped off. The dealer said the front diff already had synthetic in it (it also had the "white" breather on it from the factory) so they just topped off both the front and rear.


Does anyone know for sure if GM puts synthetic fluild in the front diff of the 04s??


If you have an 03 or 04 HD series you really need to check the differential fluid levels as soon as possible after taking delivery.
 

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I called my the local Chevy dealer and asked him about. He said the book reads .60" to.80" below the file port. Mine is about 1". Also when I checked, my was also gray with only 1,600 miles on it...should I be worried about this. I also called the dealer (GMC) were I bought it from and asked them about it...he said they knew that some needed filling and they check them as they come in....do I trust this answer? Not really...Is he just saying this to make me feel better? more than likely.





Also one other thing when I talked to the Chevy guy I asked him if this would be a warranty thing...he told me because it was a GMC and they were a Chevy dealer he could not?!?!??!?! He compaired it McDon to BurKng...WHAT THE HELL?? they are TWO different partent companies, GMC and Chevy are not!?!?!? Please clear this up I am a Ford new to this GM thing.
 

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Wiseman, you dealer is very misinformed. GM clearly specs the Grape Juice as the lubricant for these. What types of problems is he having where he feels the need to put in dino oil with a modifier againsts GM's recomendations?


Sharkbait, its unlikely that you have synthetic in the front unless it was changed out before you got it, there is a tsb for installing the synthetic fluid in cold climate area's and I am sure Alaska will qualify for that. I am noticing more and more that they have the white vent cap in them from the factory as it replaced the black cap.


NoWake, the warr thing is pretty much policy, gm dont encourage crossline warrenty unless emergency situation where the vehicle/customer is stranded. They have allowed us to do some but they are very stringent on it, the dealer next door is strictly prohibited from doing any.
<H1>Lubricant Replacement - Rear Drive Axle 9.5, 10.5, and 11.5 Inch Axles</H1><A name=ss1-860231><A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=860231&evc=sm&pubid=297&cellId=69629&mspsdsubkey=2187#ss1-860231" target="_blank">
<H5>Removal Procedure</A>


</H5>

  1. <LI =1>For the 11.5 inch axle, remove the fill plug.



    <LI =1>Remove the rear axle drain plug.
    <LI =1>Drain the lubricant into a suitable container.
    <LI =1>Inspect the drain plug for excessive metal particle accumulation. This accumulation is symptomatic of extreme wear.
    <LI =1>Clean the drain plug. </LI>
<A name=ss2-860231><A href="http://service.gm.com/servlets/BlobShtml?ShtmlFile=860231&evc=sm&pubid=297&cellId=69629&mspsdsubkey=2187#ss2-860231" target="_blank">
<H5>Installation Procedure</A></H5>




  1. <H4>Notice</H4>


    Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.






    <LI =1>Install the rear axle drain plug. Tighten


    Tighten the rear axle drain plug to 33 N·m (24 lb ft).
    <LI =1>Fill the rear axle. Use the proper fluid. Refer to Capacities - Approximate Fluid and Fluid and Lubricant Recommendations in Maintenance and Lubrication.


    <IMG id='chkImg1' name='chkImg2' height=296 alt="object Number: 665917 Size: SH" src="http://
 

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Thank you for clearing that up the dealer thing.


Should I be worried about the color with only 1,600 miles on it? Also in your expr is mine full when it is 1" below the the fill hole?


Thank you again for all the info...
 

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Discussion Starter #10
Eric, I can't clearly recall what the service manager said the issues were that he had seen with using the synthetic "grape juice"......I was a little shocked
when they told me they but dino in and wasn't thinking straight. I seem to recall him saying something about the pinnion gear / bearing and seal problems but I'm not sure. Whatever he said wasn't going to change my mind though since I hadn't heard of anything like this anywhere else......I wanted the "grape juice" put back in.


When I got the truck home I checked the levels again (since it seems like reliable service is hard to find.....wish I lived close to Grand Rapids). The fluid level in the rear differential is about 1.25" below the fill hole. Is this still too low? I was thinking it should be no more than 0.75" below the hole. I see the procedure you sent above says 3.83 qts.....where does this put the level at?
 

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to be honest, I fill them till it comes out the fill hole, I find that if I was to add up all the fluid left in the bottles it would prolly be a few ounces. That would put you right around the 3.83 that gm wants.


NoWake, the color will darken. thats normal with the breakin of the limited slip. Change it out at around the 5k mark and it will stay cleaner looking for longer..
 

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dmaxalliTech said:
Wake, the color will darken. thats normal with the breakin of the limited slip. Change it out at around the 5k mark and it will stay cleaner looking for longer..

Thank you for the info...I will change it out a 5K...thank you again!
 

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dmaxalliTech said:
..............................................


NoWake, the color will darken. thats normal with the breakin of the limited slip. Change it out at around the 5k mark and it will stay cleaner looking for longer..




We keep seeing the words limited slip pertaining to our G80 lockers. Which is it?



Changed mine at 4700miles after 400miles towing and it was b l a c k and looked like fine silt fell to the bottom of the drain pan. Looked like it might've been clutching mat'l. Oh, yes, no grape smell either.
 
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