> Apart from doing the rotation comparison test in Williams
> 'Restoring the
> TR4' book or pulling the rear cover off and counting the
> teeth on the crown
> wheel, is there any other simple way?
As old as these cars are, I would say those are the only reliable ways. The
gear sets interchange, so what it started out with is no indication of what
it has today.
However, the calibration number on your speedo will give you some indication
as to what the car left the factory with ... assuming of course the speedo
hasn't been changed. The calibration number is a 4-digit number with no
letters, which ISTR is printed below the odometer (or was that the trip
meter ?). For a 3.7 diff, it should be around 1150; for a 4.1 it will be
more like 1300.
Since they were (are) greatly prized by racers, there are very few 4.1 gear
sets running around on the street today. For example, judging by the
calibration number, TS39781LO (a TR3A) left the factory with 4.1 gears. But
it had 3.7s by the time I got it, in 1984.
Randall
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