TR6 Diff Ratios

[Trevor Jordan <tjordan@vic.bigpond.net.au>]

What is the diff ratio in a late (CF) US TR6?

The TRF catalogue states that all carb cars had 3.7 diffs, but the Moss
Europe catalogue states that:

3.7 - TR250, TR6 to (c) CC61570 carb models

3.45 - PI models

This does not explain carb models after CC61570 (c.1971).  It seems to
imply that only 3.45 diffs were used after CC61570 for both carb and PI
models.

Any suggestions?

Trevor Jordan
CF29281U