Hi Jerry :
Gerald Van Vlack wrote:
> Last summer I changed
> from a stock TR 4A 3.70 rear end to a 4.10.
> 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.
Perhaps you should shop around for a conversion box. I was quoted $80
for the same thing (don't recall who, but it was in Long Beach, CA).
> 1. Is there anyone supplying an electronic unit who can fit it to our
> speedo?
I've never heard of such a thing. Converting from mechanical motion to
electrical impulses, then fudging the count, then converting back to
mechanical motion; would seem to be much more complicated (and
expensive) than a simple, common gearbox.
> 2. What have others who have made this same switch of gears done to correct
> the speedometer readings?
I haven't done anything yet (I'm going the opposite direction, 3.45
gears for my daily driver), but I believe Mo-Ma or North Hollywood
Speedo can modify your speedo head with a new calibration (as part of a
rebuild). Doing the modification yourself does not appear to be out of
the question (see Tony Rhodes' article at
http://ourworld.compuserve.com/homepages/arhodes/Speedo.html )
There have to still be some original 4.11 speedo heads around too,
although they're hard to find. (I have one in my car, but it's not for
sale, and already promised to Tony if it becomes for sale.)
Also, later cars using the same transmission (eg late TR6) started using
different speedo drive gears in the transmission. There may be a drive
gear that would work out for the 4.11 gears.
One of the attractive (to me) things about the speedo gearbox is that
it's easy to alter the ratio for low profile tires, etc. However, I
wouldn't be surprised to find that it also requires different, if not
custom, speedo drive cables.
Another possibility is an electronic speedo that fits the original dash
hole. I've seen the one in Scrappy (Steve Hedke's Great Race TR3), and
while I'm sure it's not cheap, it is quite attractive. Since it's
white-face, he changed all the other instruments to white face units
(from a Healey ???), the result looks very nice. He also used a combo
water temp/oil pressure gauge (ala MGA), leaving an extra hole in the
gage panel. He chose a clock for the hole, but I'd love to have an oil
temp gauge.
Randall
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