Hi all :
I've lost the original post (Tony Rhodes, maybe ?), but ...
The speedo in my 59 TR3A appears to be for a 4.10 rear end. The
calibration number on the faceplate is 1325, while my TR3 spare (also
from a 59, I think) has 1180 and a TR4 spare has 1184. In every other
way, the TR3 units appears identical.
Although 1325 isn't exactly right (if 1180 is for a 3.70, 1325 should be
for a 4.15), it may be that there were a limited number of ratios
available, and Triumph chose the nearest one. Another possibility is
that the 4.10 cars were fitted with shorter tires. (1325 is within 1%
for a 4.10 axle and 165/75 tires. 1180 is within 1% for 3.70 & 155/85)
Randall
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