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Discussion Starter #1
How do I know if the factory filled it properly?


On the back side of the pumpkin there is a nut. If I loosen it will fluid drain out? Do I put my finger in to check the level? Eyeball it?


Thanks
 

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The level should be towards the bottom of the hole on level ground, if it runs out when you loosen the plug its full. Mine was over a quart low. Add 75-90wt Synthetic, like Mobil1 gear lube. Edited by: dslbrnr
 

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I just changed mine out last week at 5600 miles. Only 2 quarts came out. So much for "Dealer Prep".
 

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This really does SUCK...


I bought a quart. Poured it in and it stiil isn't full. WTF


Are the rearends filled at the dealer or by Eaton?
 

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LongBiker said:
Are the rearends filled at the dealer or by Eaton?

The factory leaves a number of things, shall we say, needing to be done?


The idea is that it's easier for the dealer to correct minor fit, flaws, fluid levels etc. than it is the factory. Translation, it's cheaper. GM pays the dealers to do what's known as a PDI, or Pre-delivery Inspection. It's a very small amount and fixed per unit. So the dealer is supposed to go through and check all the fluid levels, check the fit of the doors, etc. just give it a once over.


Since they don't usually get back what it costs them to do these, some dealers don't push it too much, and if the guy doing the PDI's is one of the newer or less "dedicated" folks in the place, well you can see where the problem is.


So to answer your question, your dealer screwed up.
 

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1.Leave out 2 quarts of $25 a quart rear end fluid in 1 million vehicles.
2.Let the dealer prep the vehicle and fill fluids to proper levels.(Or Not!)
3. Profit $50 Million, give CEO big raise, give guy who came up with idea, baseball tickets.Edited by: Pick
 

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JUST PICKED UP TRUCK 12/29, MENTIONED TO PREP MAN TO PLEASE CHECK REAR OIL . GOT A LOOK LIKE WHAT THE HELL AM I TAKING ABOUT. WHEN I WENT BACK TO GET TRUCK HE CAME UP TO ME AND THANKED ME , SAID REAR WAS 2 QUARTS LOW. ALSO HAD HIM CHECK GREASE IN FRONT SUSPENSION KIND OF DRY THERE TOO. SO IT SURE LOOKS LIKE THEY DONT FILL THINGS UP RIGHT.
 

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Nice thing about the new truck is that it has both front and rear fill and drain plugs The drain plugs are even magnetic. No gasket change, what a relief. Just changed both ends to Mobil One 75-90 Full synthetic. After driving it I am sure it will pay for itself in gas milage.
 

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I thought I saw on a post that the 3500 (1 ton) used a differant wt fluid in the front and rear than the 2500's do. is this correct ? just curious.
 

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Pick, what you say is exactly what I was thinking. Maybe GM should use a less expensive rear end fluid and possibly they would be more prone to fill the pumpkin when built. Mine was 1.9 quarts low when I picked it up. That can't be good, and if not for this site I would have run it for I don't know how long before becomming aware ( maybe 5000 mi.) Edited by: EXPSDOWN
 

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AkDually61 said:
I thought I saw on a post that the 3500 (1 ton) used a differant wt fluid in the front and rear than the 2500's do. is this correct ? just curious.

That's the C3500HD (cab chassis) I believe.
 

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When I check my fluid, I have a wire that I use to check it. I took a piece of number 12 romex (household wiring) and stripped out about a 6 inch piece of the white wire from the cable. About an inch up the wire it put a 90 degree bend in it with the vise. It works perfect to insert it into the filler hole, pull it out, and read it like a dipstick for the crankcase.


BTW, the fluid level in my 2003 was fine.
 

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I changed mine two weeks ago, and it was about 1-1/2 qts low as well. Seems like a common thread... :-(


Tim
 

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related:It's -33 celcius here last few nights.Front diff. seems super stiff. It's like the brakes are on on the front so i goes to my dealer to inquire about thinner oil like sinthetic.They proceed to tell me that GM is currently changing oil to sinthetic under warranty.Nice to know.My duramax is going to the hospital in the am. for a transfusion.
 

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JIMPRU,TSB 03-04-19-001
 

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LARSONEM said:
When I check my fluid, I have a wire that I use to check it. I took a piece of number 12 romex (household wiring) and stripped out about a 6 inch piece of the white wire from the cable. About an inch up the wire it put a 90 degree bend in it with the vise. It works perfect to insert it into the filler hole, pull it out, and read it like a dipstick for the crankcase.


BTW, the fluid level in my 2003 was fine.

I've gotton to know one of my local techs over the past few years (not due to problems). I explained to him that I have been reading on the site and asked him about the rear end level stuff. He explained the tollerance measurement GM has for the fluid level. Thanks for the idea Larsonem!!! I made one also, checked my two week old "04" and it was within GM specs on the low end. I added about 3/4 of a quart to take it to the top of the specs which is still not flowing out of the opening.........


Warden
 

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What's the spec on fill level for the front and the rear, upper and lower spec?
 

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srode, I don't recall the front diff offhand, but remember the rear diff is 3.78 qts (which puts the level about 1/2" below the fill hole.) I put close to 4 qts in my front last change and got a bit of overflow from the fill hole. Basically, it's 4 qts for both, as many folks fill the rear to the hole.
 
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