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Old 04-10-2011, 02:08 PM   #2 (permalink)
gone-ot
...beats walking...
 
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...back in the 1950's "add-on" overdrive units were very popular. Most mounted in the tailend extension of normal 3- and 4-speed manual transmissions. Some were manually engaged, others electronically.

...I had one on my 1953 flathead Ford with later-1955 3-speed transmission.
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