I have recently obtained a Rootes overdrive gearbox whose origins I
can't identify. It is a later, full synchro box, with a casting number
71981060 (my late Alpine boxes all have the same number without the 7).
It has a fine spline on the input shaft, as compared to the coarse
spline on my Alpine boxes. The adapter (part # 1981083) for the D-type
overdrive is 3.75" long, with mounts, facing downward, cast into the
adapter about half way back. There are horizontal ribs which would
preclude a standard Alpine rear mount from being fitted. The gear ratios
(shown approximately) are weird...1st 4.15; 2nd 2.3; 3rd 1.5; 4th 1;
Reverse 3.75.
I would appreciate any info about this set-up. Thanks in advance.
John Slade
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