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Re: [Fot] Final drive (differential) oil

To: fubog1 <fubog1@aol.com>
Subject: Re: [Fot] Final drive (differential) oil
From: Bob Kramer Gmail via Fot <fot@autox.team.net>
Date: Wed, 10 Aug 2022 10:51:13 -0500
Cc: fot@autox.team.net
Delivered-to: mharc@autox.team.net
Delivered-to: fot@autox.team.net
References: <1670390616.3279668.1660137041676@mail.yahoo.com>
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Good point Glen. Welding up the center section makes the soft yellow metal c=
one washers moot.=20

I=E2=80=99ve found EP90 GL4 from Car Quest (available from Advance) as a goo=
d substitute for StaLube GL4, but it overheats and failed us in endurance ra=
cing.  It has always worked in the shorter vintage race, and is cheap enough=
 the drain and refill often.=20

Sent from my iPhone

> On Aug 10, 2022, at 10:03 AM, fubog1 via Fot <fot@autox.team.net> wrote:
>=20
> =EF=BB=BF
> Welded rear gears aren't that fussy about lube, any good hypoid gear oil s=
hould be OK;
> I usually use 80-90 Valvo in them.
> The metal in the sample is a different story, they normally don't "make" a=
ny metal in operation.
> You'll have to remove the cover & get a visual on things, check the lash, m=
esh pattern & preloads best possible in situ.
>=20
> Glen Efinger
>=20
>=20
> -----Original Message-----
> From: Philip Gott via Fot <fot@autox.team.net>
> To: Friends Of Triumph <fot@autox.team.net>
> Sent: Tue, Aug 9, 2022 9:53 pm
> Subject: [Fot] Final drive (differential) oil
>=20
> Amici:
> At the risk of opening Pandora=E2=80=99s box, May I ask what gear oil you w=
ould 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 Ra=
ce. Usually there are some whiskers, but the metal flakes are concerning. Th=
e rear end is a welded diff carrying a relatively new (3 seasons) 4.1 gear s=
et.  I have yet to pull the cover. Backlash seems =E2=80=9Cnormal.=E2=80=9D T=
he rear end was set up by Quantum Mechanics whom I trust.
> What do you all run for oil (brand and viscosity) and what is your experie=
nce?
> Thanks and regards,
> Phil
>=20
> Sent from my iPhone
> _______________________________________________
> fot@autox.team.net
>=20
> http://www.fot-racing.com
>=20
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>=20
>=20
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> fot@autox.team.net
>=20
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>=20
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ail.com
>=20
>=20

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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">Good point Glen. Welding up the center sect=
ion makes the soft yellow metal cone washers moot.&nbsp;<div><br></div><div>=
I=E2=80=99ve found EP90 GL4 from Car Quest (available from Advance) as a goo=
d substitute for StaLube GL4, but it overheats and failed us in endurance ra=
cing. &nbsp;It has always worked in the shorter vintage race, and is cheap e=
nough the drain and refill often.&nbsp;<br><div><br><div dir=3D"ltr">Sent fr=
om my iPhone</div><div dir=3D"ltr"><br><blockquote type=3D"cite">On Aug 10, 2=
022, at 10:03 AM, fubog1 via Fot &lt;fot@autox.team.net&gt; wrote:<br><br></=
blockquote></div><blockquote type=3D"cite"><div dir=3D"ltr">=EF=BB=BF
<div style=3D"color:black;font: 10pt Arial, Helvetica, sans-serif;">
<div> <font size=3D"2">Welded rear gears aren't that fussy about lube, any g=
ood hypoid gear oil should be OK;</font></div>

<div><font size=3D"2">I usually use 80-90 Valvo in them.<br>
</font></div>

<div><font size=3D"2">The metal in the sample is a different story, they nor=
mally don't "make" any metal in operation.</font></div>

<div><font size=3D"2">You'll have to remove the cover &amp; get a visual on t=
hings, check the lash, mesh pattern &amp; preloads best possible in situ.</f=
ont></div>

<div><br>
</div>

<div><font size=3D"2">Glen Efinger</font><br>
</div>

<div> <br>
</div>

<div> <br>
</div>

<div style=3D"font-family:arial,helvetica;font-size:10pt;color:black"><font s=
ize=3D"2">-----Original Message-----<br>
From: Philip Gott via Fot &lt;fot@autox.team.net&gt;<br>
To: Friends Of Triumph &lt;fot@autox.team.net&gt;<br>
Sent: Tue, Aug 9, 2022 9:53 pm<br>
Subject: [Fot] Final drive (differential) oil<br>
<br>

<div dir=3D"ltr">Amici:<br>
</div>

<div dir=3D"ltr">At the risk of opening Pandora=E2=80=99s box, May I ask wha=
t gear oil you would recommend for the rear end in my TR4A (solid axle)? I a=
m running Mobil 1 75-140 and found some metal flakes on my magnetic filler p=
lug after Pitt Race. Usually there are some whiskers, but the metal flakes a=
re concerning. The rear end is a welded diff carrying a relatively new (3 se=
asons) 4.1 gear set.&nbsp; I have yet to pull the cover. Backlash seems =E2=80=
=9Cnormal.=E2=80=9D The rear end was set up by Quantum Mechanics whom I trus=
t.<br>
</div>

<div dir=3D"ltr">What do you all run for oil (brand and viscosity) and what i=
s your experience?<br>
</div>

<div dir=3D"ltr">Thanks and regards,<br>
</div>

<div dir=3D"ltr">Phil<br>
</div>

<div dir=3D"ltr"><br>
</div>

<div dir=3D"ltr">Sent from my iPhone<br>
</div>

<div dir=3D"ltr">_______________________________________________<br>
</div>

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@autox.team.net">fot@autox.team.net</a><br>
</div>

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