Subject: [Fot] differential woes

From: DAVE HOGYE via Fot <[email-masked]>
Date: Mon, 22 Jul 2019 08:49:05 -0700 (PDT)

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</head><body><p style=3D"font-size: 12pt; font-family: helvetica, arial, sa=
ns-serif; color: rgb(51, 51, 51);">While we are on the subject.&#160;&#160;=
</p><p style=3D"font-size: 12pt; font-family: helvetica, arial, sans-serif;=
 color: rgb(51, 51, 51);">I have been learning about ring and pinion set up=
. </p><p style=3D"font-size: 12pt; font-family: helvetica, arial, sans-seri=
f; color: rgb(51, 51, 51);">I had a company called Rear End Specialties in =
Santa Clara,Ca. assemble all new parts for my Southwick, TranX limited slip=
 while I was finishing building my TR3.&#160;</p><p style=3D"font-size: 12p=
t; font-family: helvetica, arial, sans-serif; color: rgb(51, 51, 51);">I di=
scovered problems immediately with the diff.&#160; First, the centering but=
ton had not been removed for the Ford axles, so the axle roller bearings ha=
d a bunch of tension and side load.&#160; 20 minuted before my &#34;first r=
ace&#34; in the car at Sonoma, my brother noticed a couple drops of gear oi=
l on a rear wheel.&#160; We pulled the wheel and brake drum and it seemed t=
he seal had failed.&#160; We wrapped a blue shop towel on it with a zip tie=
 and I finished the race.&#160;&#160;</p><p style=3D"font-size: 12pt; font-=
family: helvetica, arial, sans-serif; color: rgb(51, 51, 51);">A couple day=
s later I pulled the axle and found the outer race of the axle bearing had =
broken clean across.</p><p style=3D"font-size: 12pt; font-family: helvetica=
, arial, sans-serif; color: rgb(51, 51, 51);">Then I saw one half of the ce=
ntering button lying in the axle tube.&#160;&#160;</p><p style=3D"font-size=
: 12pt; font-family: helvetica, arial, sans-serif; color: rgb(51, 51, 51);"=
>I had no idea about the necessity of removing the button for the Ford axle=
s.&#160; Either did the rear end company.&#160;</p><p style=3D"font-size: 1=
2pt; font-family: helvetica, arial, sans-serif; color: rgb(51, 51, 51);">Th=
en a couple seasons later, I noticed there was barely detectable radial pla=
y in the pinion flange.&#160; Not good.&#160; I pulled the axle assembly an=
d took it to the shop that built it.&#160; They said they looked at it and =
all was fine.&#160; But, in hindsight I knew better.&#160; Then, a couple r=
aces later the seal started leaking.&#160; During the replacement of the se=
al I found minimal torque on the pinion flange nut.&#160; The pinion was in=
deed loose, no preload, and probably had been all along.&#160;&#160;</p><p =
style=3D"font-size: 12pt; font-family: helvetica, arial, sans-serif; color:=
 rgb(51, 51, 51);">Being just before a race weekend, I replaced the seal an=
d torqued the flange.&#160; I&#39;ve run it for a few more races since.</p>=
<p style=3D"font-size: 12pt; font-family: helvetica, arial, sans-serif; col=
or: rgb(51, 51, 51);">From the beginning I had notice a metallic sheen in t=
he gear oil and changed it regularly.&#160; This season, it of course seeme=
d to get worse.&#160;&#160;</p><p style=3D"font-size: 12pt; font-family: he=
lvetica, arial, sans-serif; color: rgb(51, 51, 51);">I&#39;ve torn it apart=
 and found the bearings trashed.&#160; Of course.&#160; I thought I might b=
e able to save the ring and pinion, but after hours and hours of moving thi=
ngs around, a good pattern could not be found.&#160; Those with lots of exp=
erience in this area would have probably guessed that they too would be tra=
shed.&#160; The ring and pinion look great, but the wear pattern had been s=
et in and can not be improved.&#160; The drive side runs off the toe and th=
e coast side is centered.&#160; I took photos of the original pattern and t=
hey are the same as now, but at the time I didn&#39;t know the difference.&=
#160; It was set up wrong from the beginning.&#160; I just trusted the rear=
 ends shops work.&#160;&#160;</p><p style=3D"font-size: 12pt; font-family: =
helvetica, arial, sans-serif; color: rgb(51, 51, 51);">I found that the pin=
ion was too high and .014&#34; back lash.&#160;&#160;</p><p style=3D"font-s=
ize: 12pt; font-family: helvetica, arial, sans-serif; color: rgb(51, 51, 51=
);">What a mess!&#160;&#160;</p><p style=3D"font-size: 12pt; font-family: h=
elvetica, arial, sans-serif; color: rgb(51, 51, 51);">I received a new ring=
 and pinion Saturday.&#160; I have polished the tooth edges and today I wil=
l begin the process all over again.&#160;</p><p style=3D"font-size: 12pt; f=
ont-family: helvetica, arial, sans-serif; color: rgb(51, 51, 51);">Thanks t=
o those who have shared tips and suggestions so far.&#160; I have been work=
ing on it at Greg Solow&#39;s Engine Room with Greg standing by and using h=
is spreader and special measuring tools.&#160; Thanks Greg.&#160; I have le=
arned a bunch...the hard way.</p><p style=3D"font-size: 12pt; font-family: =
helvetica, arial, sans-serif; color: rgb(51, 51, 51);">Dave H.</p><p style=
=3D"font-size: 12pt; font-family: helvetica, arial, sans-serif; color: rgb(=
51, 51, 51);"><br></p><p style=3D"font-size: 12pt; font-family: helvetica, =
arial, sans-serif; color: rgb(51, 51, 51);"><br></p><p style=3D"font-size: =
12pt; font-family: helvetica, arial, sans-serif; color: rgb(51, 51, 51);"><=
br></p></body></html>
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