<div dir="ltr">Depends on the diff. The spider gears have bronze cup washers on a stock diff.   The Detroit Locket has some bronze rings.<div><br clear="all"><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr">Bob Kramer</div></div></div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Apr 15, 2020 at 4:22 PM Scott Janzen via Fot <<a href="mailto:fot@autox.team.net">fot@autox.team.net</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Where is there yellow metal/ brass alloy in these diffs?<br>
<br>
Sent from my iPhone<br>
<br>
> On Apr 15, 2020, at 5:15 PM, Randall via Fot <<a href="mailto:fot@autox.team.net" target="_blank">fot@autox.team.net</a>> wrote:<br>
> <br>
> You should probably check with Redline; but my understanding is that they do<br>
> not use the sulfur/phosphorous additive that can damage yellow metal.<br>
> <br>
> According to the white paper at<br>
> <a href="https://www.redlineoil.com/Content/files/tech/Gear%20Oil%20Tech%20Info.pdf" rel="noreferrer" target="_blank">https://www.redlineoil.com/Content/files/tech/Gear%20Oil%20Tech%20Info.pdf</a><br>
> <br>
> "The extreme pressure chemistry used in many gear oils<br>
> can be corrosive to brass and bronze used in synchronizers<br>
> and bushings. Most gear oils are corrosive at<br>
> temperatures of 200°F. Red Line Gear Oils are non-corrosive<br>
> up to 300°F and the MTL® in excess of 375°F. A<br>
> corrosive gear oil can shorten synchronizer life by half<br>
> and can also contribute to rust problems."<br>
> <br>
> I don't have a link handy, but I was reading a research paper just the other<br>
> day (published in SAE Transactions) about a "dispersed solid borate"<br>
> additive that reportedly gave greatly reduced wear in big truck rear axles.<br>
> One of the other Redline documents on their website mentions "solid<br>
> microscopic particles", which could be the same thing (or not, just a WAG).<br>
> <br>
> -- Randall <br>
> <br>
> <br>
> ckproof Gear OIl All Sythetic<br>
>> <br>
>> <a href="https://www.biesheuvel.nl/product/58204-75w250-heavy-shockproo" rel="noreferrer" target="_blank">https://www.biesheuvel.nl/product/58204-75w250-heavy-shockproo</a><br>
> f-gear-oil<br>
>> In general GL5 has a higher sulfur content than GL4 has, but <br>
>> surely GL4 does contain sulfur. <br>
> <br>
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