Hi Gerald
I don't know about your car, but a lot of the Triumph range use a similar
gear box, and if you have OD you laughing, as all you need to do is find the
correct parts for the car that originally used that rear ratio, the early
2000 MKI saloons for instance had the 4.1:1 axle, also you could just count
the teeth on the speedo pinion gear and work out the ratio of turns to the
prop shaft, then reverse the maths to find the number of teeth you need on
the pinion for the axle you have. This is what I did when I put the 3.45:1
diff in my saloon, replacing a 4.1:1. I phoned ORS and they were able to
provide the right ratio bit for the application.
Graham.
----- Original Message -----
From: "Gerald Van Vlack" <jerryvv@worldnet.att.net>
To: <triumphs@autox.team.net>
Sent: Saturday, October 27, 2001 2:10 PM
Subject: Speedometer Calibration
| Hello Listers,
| This subject has come up from time to time and I would like to revisit it
| since the archives don't appear to be functioning. Last summer I changed
| from a stock TR 4A 3.70 rear end to a 4.10. Obviously the speedometer and
| odometer are now reading much too fast. I've investigated the idea of an
in
| line cable mini gearbox to re-establish the correct ratio and have a quote
| of approx $150 from a man in California to make me one.
| Here's the question (s)
| 1. Is there anyone supplying an electronic unit who can fit it to our
| speedo? It would seem that the Street Rod Boys would use something like
this
| when they make all of their changes but want to keep the interior as
| original, including the gauges of course.
| 2. What have others who have made this same switch of gears done to
correct
| the speedometer readings?
| 3. Has anyone made their own mini gearbox to fit in line? Where would I
get
| the gears and proper connections for the cable ends? I'm thinking that I
| would need a 37 tooth gear to drive a 41 tooth gear to slow the cable
speed
| down from it's higher speed. Making a little gear box to do that might be
a
| nice winter project.
| 4. Looking for the collective wisdom of the list.
| 5. Does Nissonger do this? I haven't asked them yet but will be writing
them
| today.
| Thanks,
| Jerry Van Vlack
|
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