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I don't know much about TR6. I installed a J type overdrive in a Stag. At
the back of the inside of the OD is a gear which rotates the Speedo drive.
This needs to match the odo meter.. On the stag I recall the gear inside is
a 6 start and the drive gear is an 18 tooth gear. Look at my blog. There is
a no. Stamped at the back of the OD. Very small. This tells you what gear
is in the OD.
On Mon, Aug 24, 2020, 6:54 AM Geo Hahn <ahwahneetr@gmail.com> wrote:
> Jeff - I think the important thing is whether your odometer is (more or
> less) correct.
>
> If the odo reads right then you may only need a simple adjustment to
> needle position... something you can probably do sitting at the dining room
> table.
>
>
> On Mon, Aug 24, 2020, 6:14 AM Jeff Scarbrough <fishplate@gmail.com> wrote:
>
>> I have a 1975 TR6. With the original gearbox, the speedometer was
>> correct. I took it out to add overdrive and put in a gearbox from a 1974
>> while I worked on it. That gearbox made the speedo read about 12% higher.
>>
>> Got the overdrive on the box and in the car. My speedo still reads
>> high. I'd like to find a simple solution...
>>
>> Do I try to find the right drive gear for the gearbox output, or do I get
>> a different speedometer?
>>
>>
>> Jeff Scarbrough
>> Corrosion Acres, Ga.
>> ** triumphs@autox.team.net **
>>
>> Donate: http://www.team.net/donate.html
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>>
> ** triumphs@autox.team.net **
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<div dir=3D"auto">I don't know much about TR6. I installed a J type ove=
rdrive in a Stag. At the back of the inside of the OD is a gear which rotat=
es the Speedo drive. This needs to match the odo meter.. On the stag I reca=
ll the gear inside is a 6 start and the drive gear is an 18 tooth gear. Loo=
k at my blog. There is a no. Stamped at the back of the OD. Very small. Thi=
s tells you what gear is in the OD.</div><br><div class=3D"gmail_quote"><di=
v dir=3D"ltr" class=3D"gmail_attr">On Mon, Aug 24, 2020, 6:54 AM Geo Hahn &=
lt;<a href=3D"mailto:ahwahneetr@gmail.com";>ahwahneetr@gmail.com</a>> wro=
te:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;b=
order-left:1px #ccc solid;padding-left:1ex"><div dir=3D"auto"><div>Jeff - I=
think the important thing is whether your odometer is (more or less) corre=
ct.<div dir=3D"auto"><br></div><div dir=3D"auto">If the odo reads right the=
n you may only need a simple adjustment to needle position... something you=
can probably do sitting at the dining room table.</div><br><br><div class=
=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Mon, Aug 24, 2020=
, 6:14 AM Jeff Scarbrough <<a href=3D"mailto:fishplate@gmail.com"; target=
=3D"_blank" rel=3D"noreferrer">fishplate@gmail.com</a>> wrote:<br></div>=
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><div dir=3D"ltr">I have a 1975 TR6.=C2=A0 =
=C2=A0With the original gearbox, the speedometer was correct.=C2=A0 I took =
it out to add overdrive and put in a gearbox from a 1974 while I worked on =
it.=C2=A0 That gearbox made the speedo read about 12% higher.<div><br></div=
><div>Got the overdrive on the box and in the car.=C2=A0 My speedo still re=
ads high.=C2=A0 I'd like to find a simple solution...</div><div><br></d=
iv><div>Do I try to find the right drive gear for the gearbox output, or do=
I get a different speedometer?</div><div><br></div><div><br>Jeff Scarbroug=
h</div><div>Corrosion Acres, Ga.</div></div>
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m</a><br>
</blockquote></div></div></div>
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