From what I found out a 2010 transtar with 10 sp. Eaton Fuller is recommended to have chevron sae 40 synthetic transmission oil, used to be sae 50. For the rear differentials I just have some conventional 80w90 I was going to use just to fill to correct level. Sound about right?
Transmission oil / differential oil
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Jhncp, Feb 27, 2020.
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@Heavyd can tell you for sure. I prefer synthetic all the way around.
jamespmack Thanks this. -
Here is the Eaton lube manual.
https://www.eaton.com/ecm/groups/public/@pub/@eaton/@roadranger/documents/content/tcmt0021en-us.pdf
You need to check the fill plug on the diffs. If it was factory filled with synthetic, there is a disc attached to the plug saying so. You don't want to mix types. -
There is a disc attached to each plate. So 75w90 synthetic?
jamespmack Thanks this. -
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Those discs do fall off. And second not mixing the oils. Just spend the money and put in what it uses.
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It cost more, but buying a 5gal bucket and a pump will be well worth it Compaired to putting it in by the quart. I know it seems like a waist, but its tax deductible and helps you build your arsenal of tools if you plan on doing this a lifetime.
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