John;
This past summer I put in an unknown year j-type with transmission in my
76 and found that the speedometer was reading about 15% too high. Since
then it seems like the speedometer and the speedometer driving gear
inside the j-type are different between 73-74 and 75-76 model years,
according to catalogs. I have an 8-tooth driving gear, and TRF listed
the AAU1096 gear as having 7 teeth on their online description. The
difference is about 1% or so, so I figured I must have a unit out of the
earlier year. PS I have a 20 tooth pinion, which I understand is correct
and is unchanged for 73-76 years.
I contacted the big 3 about the driving gear and no one had it. Charles
at TRF said this part hadnt been ordered by anyone in quite a while, but
he offered to look into it. He called back and said he could get it
special order and it would take 2-3 weeks. That was about two weeks
ago, so I don't know how long its really gonna take, but Charles sounded
fairly certain about it. Anyway, its not $25 anymore, its more like
$60, but I still figured it would be about the same or less than the
alternatives (ie getting a used 73-74 speedo or having mine racalibrated
or getting a reducer). So you may want to consider contacting TRF about
this gear if that's how you want to go.
But you got the Volvo j-type, which I think Vance has covered. So if
you try and change the driving gear, the Volvo pinion wont work anyway.
In that case you would have to get a new pinion, sleeve, ferrule, and
retainer to match, which can be had from Quantum Mechanics, but it
probably gonna run about $100.
John Lumia
76 TR6
Date: Mon, 26 Dec 2005 01:34:25 -0500
From: "John North" < >
Subject:
I am into a Volvo OD, and am a bit confused about the speedo. I have
Nelson and Vance's articles, and Vance suggests various work-arounds for
modifying the Volvo gears to make the speedo correct for the TR6.
However,
it looks like I can buy the drive and driven gears from TRF for a 76 TR6
for
only about $25. If I remove the gears from the Volvo unit and fit the
TR6
ones, will that do the job? I am at the stage of driving out the
annulus
to get at the speedo drive gear, and I'm just not sure that I have this
figured right. If I go further now, I will need a press to put this
back
together and Christmas is over, so that won't be in my stocking.
John North
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