I just try to ease the strain on the unit by taking my foot off the gas when
shifting into overdrive and giving it a little gas when coming out (actually
my throttle switch takes care of that part). This more closely matches O/D
speed with O/D speed as it shifts.
I have had good luck driving my TR4A with OD for about ten years with no
mechanical problems and 8 years in the Healey with no mechanical problems
with the O/D (probably just jinxed myself).
I use the O/D all the time even when driving in town if speeds exceed 45-50
or so because the 100 motor doesn't really feel very happy at higher revs,
not just on long highway cruises.
Long ago when I was first driving British cars the owner of one of the parts
shops I frequented said the cars were happier and more dependable
mechanically if used regularly than if they sit. I took the advice to heart
for my cars including the o/d unit. Don't know if it is right, but it is
sure more fun than leaving it sitting in the garage.
Greg Lemon
54 BN1
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