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How to Change Front Differentail Fluid

Demonstrated on a 2010 Sierra 1500
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Re: How to Change Front Differentail Fluid

Postby Belo83 » Oct 31 2015, 8:30pm

19trax95 wrote:If your wanting to know what fluid to put back in after you replace the seal, then 75w90 will work fine as will 80w90.

I like synthetic so I always use 75w90


Not saying you're wrong... But the manual does call for 80 in the front diff and 75 in the rear. Why would they make their assembly process more complicated if they didn't feel it was necessary?
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Re: How to Change Front Differentail Fluid

Postby esox07esox07 is online! » Oct 31 2015, 11:19pm

Belo83: You are correct, but it is very common practice to use the 75W90 in both for a couple of reasons. First, it is much more readily available and second it can be found in Synthetic where the 80W90 typically cannot. It has been a common practice by many people for many years. If it did present a problem, I am sure it would have surfaced by now. Also, there is an explanation that 75W90 is a viable substitute for 80W90 due to the viscosity levels of the two. I don't know enough about that but it has been explained in other threads a few times before.
If you have any concerns, then just find the 80W90 and go with it. But, I have read enough and asked enough questions to feel completely at ease (actually even more so) with using the Synthetic 75W90.
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Re: How to Change Front Differentail Fluid

Postby Z15 » Oct 31 2015, 11:36pm

Belo83 wrote:
19trax95 wrote:If your wanting to know what fluid to put back in after you replace the seal, then 75w90 will work fine as will 80w90.

I like synthetic so I always use 75w90


Not saying you're wrong... But the manual does call for 80 in the front diff and 75 in the rear. Why would they make their assembly process more complicated if they didn't feel it was necessary?


The gear cases come to the assembly plant already filled with g. lube by the manufacturer.

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Re: How to Change Front Differentail Fluid

Postby Copperhead » Nov 01 2015, 2:26am

Why would anyone want to be mediocre as the OEM and put in a mediocre 80w90 when they could use a higher quality 75w90. Outside of our pickup situations, lets take a look at the commercial trucks. If I use a 75w90 synthetic in my differentials on my semi truck instead of the standard 80w90, the diff OEM will extend the warranty 50%. From 500,000 miles to 750,000 miles. You think they might actually know the benefits of using a 75w90 in place of a 80w90? The standard factory fill is an 80w90 like our pickups. But one can specify 75w90 as the factory fill, and if one continues to use 75w90, the extended warranty is in force. Free of charge. Likewise, the OEM standard differential lube change interval recommendations go from 300,000 to 500,000 miles. All in a OEM lube manual to see if one wants to look. Meritor, Dana/Spicer, etc axles.

Now, again, why would anyone want to fill a diff with a mediocre 80w90 when at high quality 75w90 synthetic offers so much better performance. Lower temps, more resistance to pressure shearing, etc. Seems like a no brainer. After years of experience with 75w90 synthetics in my commercial stuff, it is the ONLY thing going in my pickup diffs.

And Mike is right... the axles are already filled with lube from the axle manufacturer. They go off the rack and onto the assembly line. I have hauled thousands of axles to assembly plants and watched how they do things. The assembly plants are not complicating their operation by specifying different lubes. The plant that makes the axles has them already to go into assembly when they arrive.
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Re: How to Change Front Differentail Fluid

Postby Belo83 » Nov 01 2015, 2:01pm

Wasn't saying it was wrong or bad to use 75. Just find it interesting that the manual doesn't call for it. It's an oil, I'm assuming most of us the recommended engine oil and not different from what oem calls for. That was all.
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Re: How to Change Front Differentail Fluid

Postby 13CB271 » Nov 01 2015, 2:22pm

I forgot to ask this in my post from earlier, but when I was at the auto store I did notice right next to the 75w-90 that i bought, SYNTHETIC 80w-90.

http://www.amsoil.com/shop/by-product/g ... gear-lube/

I didn't even know this existed to this point but was already set on the 75w-90 after much research.

To the amsoil rep, Z15, on your website for my 13 it says this for the front diff:

Differential, Front S4WD......SLF [2]
All TEMPS......
SEVERE GEAR 75W-90 Synthetic EP Lubricant (SVGQT)
75W-90 Synthetic Long Life Gear Lube (FGRQT)

For the 2015:

Differential, Front 8.25 RG......GL-5
All TEMPS......80W-90 [3]
SEVERE GEAR 75W-90 Synthetic EP Lubricant (SVGQT)

I'm interested to know why you guys push only the 75w-90 on the 13 but do go along with OEM specs for 15 and say to use 80w-90.


Also, the chart you posted ends on 2005 models. Do you have a chart showing the 2007-2013, and then 14-15?

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Re: How to Change Front Differentail Fluid

Postby jake2250 » Mar 24 2016, 11:31pm

Well, The weather was nice today so I spent twenty minutes and change the rear diff fluid today. Having a drain plug made it really easy and I have plenty of room to fill the diff from the bottles with just a big squeeze! The Auto store only had three bottles of Mobil 1 so hopefully they will get more by this weekend so I can do the front.
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Re: How to Change Front Differentail Fluid

Postby LLAMA » Mar 24 2016, 11:52pm

Does any one know if the 2500's use the same fluid? Going to do mine tomorrow.
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Re: How to Change Front Differentail Fluid

Postby jake2250 » Mar 24 2016, 11:59pm

LLAMA wrote:Does any one know if the 2500's use the same fluid? Going to do mine tomorrow.

Owners manual says SAE 75-90 Synthetic Axle Lubricant! Front is 75-90 Also.
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Re: How to Change Front Differentail Fluid

Postby LLAMA » Mar 25 2016, 12:04am

Sweet thx:)
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