<html><head></head><body><div class="ydp4fa6b0ebyahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:16px;"><div><div dir="ltr" data-setdir="false">I like the Swepco 201-80 weight, we use it in our Spit transmissions and diffs, we also use it in our Cup Car and TA cars. My experience has not been good with the Red Line products. I learned about the Swepco oil in the late 70's, it's what Gurney used in the Indy cars and GTP cars. At the end of the day Autozone gear oil would work so it's really not a difficult decision, just pick something and give it a try.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">The heat is coming from the diff set up and while oil may help a few degree's it will not be the savior of your diff unfortunately.</div><div><br></div><div class="ydp4fa6b0ebsignature"><div style="font-family:Helvetica, Arial, sans-serif;font-size:16px;"><div dir="ltr">Rick Parent</div><div dir="ltr"><br></div><div dir="ltr">"<i>Doing the right thing is always the right thing, regardless of consequences</i>"</div><div dir="ltr"><br></div></div></div></div>
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On Thursday, August 11, 2022 at 06:34:35 PM MST, Enquiries Road & Track via Fot <fot@autox.team.net> wrote:
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<div><div id="yiv7939431619"><div><div dir="ltr">i offer some comments based on decades of dealing with this issue in lots of different race cars <div><br clear="none"></div><div>to select the correct viscosity, you really need to know the operating temperature</div><div><br clear="none"></div><div>Adhesive temp indicating labels on the outside of the main diff case are usually the easiest method. they will give you a good idea of whats happening inside</div><div><br clear="none"></div><div>typically, the outer case is a few degrees cooler that the circulating oil, so be cautious here as it is most likely a lot "cooler" then the oil film between the ring and the pinion at the point of their contact</div><div><br clear="none"></div><div>if you are seeing temps much over 100C on the outer, then the old 90 weight diff oils are highly unlikely to acceptable</div><div><br clear="none"></div><div>once most 'off-the-shelf" oils get to about 100C, they are starting to degrade , some irrevocably (ie they are stuffed!!)</div><div><br clear="none"></div><div>once you have an idea of temps , start looking at kinematic viscosity of the oil being suggested. simplistically, its this value that allow the oil to function as a metal to metal separator and the hotter things get, the lower the viscosity becomes, and the lower the chance of it keeping metals apart. the various brands of "race oils" can differ widely in this regard</div><div><br clear="none"></div><div>in most modern rear-drive race cars we are using 140 grade purpose-made race gear oils, and these have all sorts of fancy additives </div><div><br clear="none"></div><div>microfinishing the ring and pinion gears prior to a diff build, can drop working temperatures considerably</div><div><br clear="none"></div><div>hope this helps in some way</div><div><div><div dir="ltr" class="yiv7939431619gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><br clear="none"></div><div>Terry</div><div>Australia<br clear="none"><br clear="none"></div></div></div></div></div></div></div></div></div></div></div></div></div></div><br clear="none"></div></div><br clear="none"><div class="yiv7939431619gmail_quote"><div id="yiv7939431619yqt39131" class="yiv7939431619yqt0936000716"><div dir="ltr" class="yiv7939431619gmail_attr">On Fri, Aug 12, 2022 at 12:35 AM Phil Gott via Fot <<a rel="nofollow noopener noreferrer" shape="rect" ymailto="mailto:fot@autox.team.net" target="_blank" href="mailto:fot@autox.team.net">fot@autox.team.net</a>> wrote:<br clear="none"></div><blockquote style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex;" class="yiv7939431619gmail_quote"><div style="font-size:10pt;font-family:arial, helvetica, sans-serif;color:black;"><div style="font-family:arial, helvetica, sans-serif;font-size:10pt;color:black;">Thank you, everyone!</div><div style="font-family:arial, helvetica, sans-serif;font-size:10pt;color:black;"><br clear="none"></div><div style="font-family:arial, helvetica, sans-serif;font-size:10pt;color:black;">It would seem that lubes designed for the everyday street-driven car aren't up to the challenge of racing our hyping diffs. I thought the folks at Mobil would have done better, but apparently not enough. I've taken all your inputs into consideration and going with the Redline Shockproof (lightweight) oil. I'm also thinking of bolting on the aluminum cover of the 4A IRS diff to get a little extra capacity and perhaps some better cooling, although the added thickness may offset the higher rate of heat transfer through the metal. Will do the math.</div><div style="font-family:arial, helvetica, sans-serif;font-size:10pt;color:black;"><br clear="none"></div><div style="font-family:arial, helvetica, sans-serif;font-size:10pt;color:black;">Your insights are much appreciated.</div><div style="font-family:arial, helvetica, sans-serif;font-size:10pt;color:black;"><br clear="none"></div><div style="font-family:arial, helvetica, sans-serif;font-size:10pt;color:black;">Regards,</div><div style="font-family:arial, helvetica, sans-serif;font-size:10pt;color:black;"><br clear="none"></div><div style="font-family:arial, helvetica, sans-serif;font-size:10pt;color:black;">Phil Gott</div><div style="font-family:arial, helvetica, sans-serif;font-size:10pt;color:black;">Red '65 4A, #114<br clear="none"><br clear="none"><br clear="none">-----Original Message-----<br clear="none">From: Alexandre Camoletti via Fot <<a rel="nofollow noopener noreferrer" shape="rect" ymailto="mailto:fot@autox.team.net" target="_blank" href="mailto:fot@autox.team.net">fot@autox.team.net</a>><br clear="none">To: <a rel="nofollow noopener noreferrer" shape="rect" ymailto="mailto:fot@autox.team.net" target="_blank" href="mailto:fot@autox.team.net">fot@autox.team.net</a><br clear="none">Sent: Thu, Aug 11, 2022 4:38 am<br clear="none">Subject: Re: [Fot] Final drive (differential) oil<br clear="none"><br clear="none"></div><div id="yiv7939431619gmail-m_-8028308041457436653yiv9509520834"><div><div><p><span style="color:rgb(68,84,106);">Gents, when heats becomes a problem then you should definitely try the Lucas oils. Measure temperatures before and after the change, the difference is usually quite big !</span></p><p><span style="color:rgb(68,84,106);"> </span></p><p><b><span lang="FR" style="font-size:10pt;">De :</span></b><span lang="FR" style="font-size:10pt;"> Fot [mailto:<a rel="nofollow noopener noreferrer" shape="rect" ymailto="mailto:fot-bounces@autox.team.net" target="_blank" href="mailto:fot-bounces@autox.team.net">fot-bounces@autox.team.net</a>] <b>De la part de</b> fubog1 via Fot<br clear="none"><b>Envoyé :</b> mercredi 10 août 2022 19:25<br clear="none"><b>À :</b> <a rel="nofollow noopener noreferrer" shape="rect" ymailto="mailto:fot@autox.team.net" target="_blank" href="mailto:fot@autox.team.net">fot@autox.team.net</a><br clear="none"><b>Cc :</b> <a rel="nofollow noopener noreferrer" shape="rect" ymailto="mailto:fot@autox.team.net" target="_blank" href="mailto:fot@autox.team.net">fot@autox.team.net</a><br clear="none"><b>Objet :</b> Re: [Fot] Final drive (differential) oil</span></p><p> </p><div id="yiv7939431619gmail-m_-8028308041457436653yiv9509520834yqt75679"><div><div><p><span style="font-size:10pt;color:black;">Bob you bring up another good point as well, there's a big difference between a 20 minute sprint race & an enduro, the heat is a much bigger consideration...</span></p></div><div><p><span style="font-size:10pt;color:black;"> </span></p></div><div><p><span style="font-size:10pt;color:black;">Glen Efinger</span></p></div><div><p><span style="font-size:10pt;color:black;"> </span></p></div><div><p><span style="font-size:10pt;color:black;"> </span></p></div><div><p style="margin-bottom:12pt;"><span style="font-size:10pt;color:black;">-----Original Message-----<br clear="none">From: Bob Kramer Gmail via Fot <<a rel="nofollow noopener noreferrer" shape="rect" ymailto="mailto:fot@autox.team.net" target="_blank" href="mailto:fot@autox.team.net">fot@autox.team.net</a>><br clear="none">To: fubog1 <<a rel="nofollow noopener noreferrer" shape="rect" ymailto="mailto:fubog1@aol.com" target="_blank" href="mailto:fubog1@aol.com">fubog1@aol.com</a>><br clear="none">Cc: <a rel="nofollow noopener noreferrer" shape="rect" ymailto="mailto:fot@autox.team.net" target="_blank" href="mailto:fot@autox.team.net">fot@autox.team.net</a><br clear="none">Sent: Wed, Aug 10, 2022 11:51 am<br clear="none">Subject: Re: [Fot] Final drive (differential) oil</span></p><div id="yiv7939431619gmail-m_-8028308041457436653yiv9509520834"><div><p><span style="font-size:10pt;color:black;">Good point Glen. Welding up the center section makes the soft yellow metal cone washers moot. </span></p><div><p><span style="font-size:10pt;color:black;"> </span></p></div><div><p><span style="font-size:10pt;color:black;">I’ve found EP90 GL4 from Car Quest (available from Advance) as a good substitute for StaLube GL4, but it overheats and failed us in endurance racing. It has always worked in the shorter vintage race, and is cheap enough the drain and refill often. </span></p><div><p><span style="font-size:10pt;color:black;"> </span></p><div><p><span style="font-size:10pt;color:black;">Sent from my iPhone</span></p></div><div><p><span style="font-size:10pt;color:black;"><br clear="none"><br clear="none"></span></p><p style="margin-bottom:12pt;"><span style="font-size:10pt;color:black;">On Aug 10, 2022, at 10:03 AM, fubog1 via Fot <<a rel="nofollow noopener noreferrer" shape="rect" ymailto="mailto:fot@autox.team.net" target="_blank" href="mailto:fot@autox.team.net">fot@autox.team.net</a>> wrote:</span></p></div><blockquote style="margin-top:5pt;margin-bottom:5pt;"><div><p><span style="font-size:10pt;color:black;"> </span></p><div id="yiv7939431619gmail-m_-8028308041457436653yiv9509520834yqt05668"><div><div><p><span style="font-size:10pt;color:black;">Welded rear gears aren't that fussy about lube, any good hypoid gear oil should be OK;</span></p></div><div><p><span style="font-size:10pt;color:black;">I usually use 80-90 Valvo in them.</span></p></div><div><p><span style="font-size:10pt;color:black;">The metal in the sample is a different story, they normally don't "make" any metal in operation.</span></p></div><div><p><span style="font-size:10pt;color:black;">You'll have to remove the cover & get a visual on things, check the lash, mesh pattern & preloads best possible in situ.</span></p></div><div><p><span style="font-size:10pt;color:black;"> </span></p></div><div><p><span style="font-size:10pt;color:black;">Glen Efinger</span></p></div><div><p><span style="font-size:10pt;color:black;"> </span></p></div><div><p><span style="font-size:10pt;color:black;"> </span></p></div><div><p style="margin-bottom:12pt;"><span style="font-size:10pt;color:black;">-----Original Message-----<br clear="none">From: Philip Gott via Fot <<a rel="nofollow noopener noreferrer" shape="rect" ymailto="mailto:fot@autox.team.net" target="_blank" href="mailto:fot@autox.team.net">fot@autox.team.net</a>><br clear="none">To: Friends Of Triumph <<a rel="nofollow noopener noreferrer" shape="rect" ymailto="mailto:fot@autox.team.net" target="_blank" href="mailto:fot@autox.team.net">fot@autox.team.net</a>><br clear="none">Sent: Tue, Aug 9, 2022 9:53 pm<br clear="none">Subject: [Fot] Final drive (differential) oil</span></p><div><p><span style="font-size:10pt;color:black;">Amici:</span></p></div><div><p><span style="font-size:10pt;color:black;">At the risk of opening Pandora’s box, May I ask what gear oil you would recommend for the rear end in my TR4A (solid axle)? I am running Mobil 1 75-140 and found some metal flakes on my magnetic filler plug after Pitt Race. Usually there are some whiskers, but the metal flakes are concerning. The rear end is a welded diff carrying a relatively new (3 seasons) 4.1 gear set. I have yet to pull the cover. Backlash seems “normal.” The rear end was set up by Quantum Mechanics whom I trust.</span></p></div><div><p><span style="font-size:10pt;color:black;">What do you all run for oil (brand and viscosity) and what is your experience?</span></p></div><div><p><span style="font-size:10pt;color:black;">Thanks and regards,</span></p></div><div><p><span style="font-size:10pt;color:black;">Phil</span></p></div><div><p><span style="font-size:10pt;color:black;"> </span></p></div><div><p><span style="font-size:10pt;color:black;">Sent from my iPhone</span></p></div><div><p><span style="font-size:10pt;color:black;">_______________________________________________</span></p></div><div><p><span style="font-size:10pt;color:black;"><a rel="nofollow noopener noreferrer" shape="rect" ymailto="mailto:fot@autox.team.net" target="_blank" href="mailto:fot@autox.team.net">fot@autox.team.net</a></span></p></div><div><p><span style="font-size:10pt;color:black;"> </span></p></div><div><p><span 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