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Even when the cars were new, it was an accepted fact at the factory that d=
ifferential units, were inherently noisy. They howled or moaned or rumbled=
and this issue affected the whole model range. It was unusual to find a c=
ar with a quiet one! Many different =E2=80=98cures=E2=80=99 were tried and=
the only moderately successful one was to change the machining angle of t=
he gear teeth. The axles were all bought-in components from (I think a com=
pany called Salisbury) who maintained that modifying the manufacturing pro=
cess (angle of gear teeth cutting) would result in a higher cost price whi=
ch the Purchase Department refused to consider, so we were stuck with nois=
y axles. End of story.
Jonmac
From: Greg Lemon <grglmn@gmail.com>
Sent: 27 January 2022 15:28
To: Alex & Janet Thomson <aljlthomson@charter.net>; Triumphs <triumphs@aut=
ox.team.net>
Subject: Re: [TR] [6pack] Rear end clunk
I chased after a "rear end" clunk for years. Decided it was in the differ=
ential, and decided to replace it with a Nissan R200 limited slip after re=
placing u-joints and checking mounts many times. When I was installing th=
e differential and new, shortened drive shaft I discovered one of the tran=
smission mount bolts had gone missing.
If you are not finding it, may be worth expanding your search, however, th=
e only when cold thing is a bit of a head scratcher.
BTW, very glad I did the diff swap, even though it was not the cause of th=
e clunk, car is much quieter, especially with the top up.
Greg Lemon
TR250
On Thu, Jan 27, 2022, 9:10 AM Alex & Janet Thomson <aljlthomson@charter.ne=
Don=E2=80=99t rule out worn driveshaft U-joints or worn/loose mounting bus=
hings on the differential itself.
Alex Thomson
Sent: Thursday, January 27, 2022 9:43 AM
Subject: [6pack] Rear end clunk
Twenty years of rear end clunk when I put it in reverse with cold engine a=
nd I'm tired of it. But as soon as the engine warms up it disappears and i=
dismiss it. Do I bite the bullet and get it checked out? I'm sure my mech=
anic will say get it fixed. And how much do you think a repaired rear end =
will cost me?
Al in CT with 74 French Blue
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</o:shapelayout></xml><![endif]--></head><body lang=3DEN-GB link=3Dblue vli=
nk=3Dpurple style=3D'word-wrap:break-word'><div class=3DWordSection1><p cla=
ss=3DMsoNormal><span style=3D'mso-fareast-language:EN-US'>Even when the car=
s were new, it was an accepted fact at the factory that differential units,=
were inherently noisy. They howled or moaned or rumbled and this issue aff=
ected the whole model range. It was unusual to find a car with a quiet one!=
Many different =E2=80=98cures=E2=80=99 were tried and the only moderately =
successful one was to change the machining angle of the gear teeth. The axl=
es were all bought-in components from (I think a company called Salisbury) =
who maintained that modifying the manufacturing process (angle of gear teet=
h cutting) would result in a higher cost price which the Purchase Departmen=
t refused to consider, so we were stuck with noisy axles. End of story. <o:=
p></o:p></span></p><p class=3DMsoNormal><span style=3D'mso-fareast-language=
:EN-US'><o:p> </o:p></span></p><p class=3DMsoNormal><span style=3D'mso=
-fareast-language:EN-US'>Jonmac<o:p></o:p></span></p><p class=3DMsoNormal><=
span style=3D'mso-fareast-language:EN-US'><o:p> </o:p></span></p><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0=
cm'><p class=3DMsoNormal><b><span lang=3DEN-US>From:</span></b><span lang=
=3DEN-US> Greg Lemon <grglmn@gmail.com> <br><b>Sent:</b> 27 January 2=
022 15:28<br><b>To:</b> Alex & Janet Thomson <aljlthomson@charter.ne=
t>; Triumphs <triumphs@autox.team.net><br><b>Subject:</b> Re: [TR]=
[6pack] Rear end clunk<o:p></o:p></span></p></div><p class=3DMsoNormal><o:=
p> </o:p></p><div><p class=3DMsoNormal>I chased after a "rear end=
" clunk for years. Decided it was in the differential, and decid=
ed to replace it with a Nissan R200 limited slip after replacing u-joints a=
nd checking mounts many times. When I was installing the differential=
and new, shortened drive shaft I discovered one of the transmission mount =
bolts had gone missing.<o:p></o:p></p><div><p class=3DMsoNormal><o:p> =
</o:p></p></div><div><p class=3DMsoNormal>If you are not finding it, may be=
worth expanding your search, however, the only when cold thing is a bit of=
a head scratcher.<o:p></o:p></p></div><div><p class=3DMsoNormal><o:p> =
;</o:p></p></div><div><p class=3DMsoNormal>BTW, very glad I did the diff sw=
ap, even though it was not the cause of the clunk, car is much quieter, esp=
ecially with the top up.<o:p></o:p></p></div><div><p class=3DMsoNorma=
l><o:p> </o:p></p></div><div><p class=3DMsoNormal>Greg Lemon<o:p></o:p=
></p></div><div><p class=3DMsoNormal>TR250<o:p></o:p></p></div></div><p cla=
ss=3DMsoNormal><o:p> </o:p></p><div><div><p class=3DMsoNormal>On Thu, =
Jan 27, 2022, 9:10 AM Alex & Janet Thomson <<a href=3D"mailto:aljlth=
omson@charter.net">aljlthomson@charter.net</a>> wrote:<o:p></o:p></p></d=
iv><blockquote style=3D'border:none;border-left:solid #CCCCCC 1.0pt;padding=
:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm'><div><div><p class=
=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><=
span lang=3DEN-US style=3D'color:#1F497D'>Don=E2=80=99t rule out worn drive=
shaft U-joints or worn/loose mounting bushings on the differential itself.<=
/span><span lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal style=
=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=3DEN-US =
style=3D'color:#1F497D'> </span><span lang=3DEN-US><o:p></o:p></span><=
/p><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-=
alt:auto'><span lang=3DEN-US style=3D'color:#1F497D'>Alex Thomson</span><sp=
an lang=3DEN-US><o:p></o:p></span></p><p class=3DMsoNormal style=3D'mso-mar=
gin-top-alt:auto;mso-margin-bottom-alt:auto'><span lang=3DEN-US style=3D'co=
lor:#1F497D'> </span><span lang=3DEN-US><o:p></o:p></span></p><p class=
=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><=
b><span lang=3DEN-US style=3D'font-size:10.0pt;font-family:"Tahoma",sans-se=
rif'>From:</span></b><span lang=3DEN-US style=3D'font-size:10.0pt;font-fami=
ly:"Tahoma",sans-serif'> 6pack [mailto:<a href=3D"mailto:6pack-bounces@auto=
x.team.net" target=3D"_blank">6pack-bounces@autox.team.net</a>] <b>On Behal=
f Of </b><a href=3D"mailto:otral@juno.com"; target=3D"_blank">otral@juno.com=
</a><br><b>Sent:</b> Thursday, January 27, 2022 9:43 AM<br><b>To:</b> <a hr=
ef=3D"mailto:6pack@autox.team.net"; target=3D"_blank">6pack@autox.team.net</=
a><br><b>Subject:</b> [6pack] Rear end clunk</span><span lang=3DEN-US><o:p>=
</o:p></span></p><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-=
margin-bottom-alt:auto'><span lang=3DEN-US> <o:p></o:p></span></p><div=
><p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-al=
t:auto'><span lang=3DEN-US>Twenty years of rear end clunk when I put it in =
reverse with cold engine and I'm tired of it. But as soon as the engine war=
ms up it disappears and i dismiss it. Do I bite the bullet and get it check=
ed out? I'm sure my mechanic will say get it fixed. And how much do you thi=
nk a repaired rear end will cost me? <o:p></o:p></span></p></div><div>=
<p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt=
:auto'><span lang=3DEN-US> <o:p></o:p></span></p></div><div><p class=
=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><=
span lang=3DEN-US>Al in CT with 74 French Blue<o:p></o:p></span></p></div><=
p class=3DMsoNormal style=3D'mso-margin-top-alt:auto;mso-margin-bottom-alt:=
auto'><span lang=3DEN-US><br><br></span><span lang=3DEN-US style=3D'font-si=
ze:10.0pt;color:black'>____________________________________________________=
________</span><span lang=3DEN-US><br><a href=3D"https://store.netzero.net/=
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ag695&promoCode=3DA34454" target=3D"_blank"><b><span style=3D'font-fami=
ly:"Arial",sans-serif;color:#004080;text-decoration:none'>Choose to be safe=
r online.</span></b><span style=3D'font-family:"Arial",sans-serif;text-deco=
ration:none'><br></span><span style=3D'font-size:10.0pt;font-family:"Arial"=
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nes&utm_campaign=3Dnzlifelk_launch&utm_content=3Dtag695&promoCo=
de=3DA34454" target=3D"_blank">NetZero.com/NortonLifeLock</a></span><span l=
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=3D'margin-bottom:12.0pt'>_______________________________________________<b=
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