I remember the overdrive units that were on Baldwin-Motion cars as my Uncle had old Hot Rodding/Hot Rod and Car Craft mags that I looked at a lot before I was a teenager, funny how certain things stick with you over time! Basically a Z/28 would have a 4.88 rearend and you'd pull the lever inside the car and have a 3.42.
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There was a time when you could order an O/D unit with a new car/truck. Had one on my '56 Ford P/U. Loved it!
Gear-Vender (Vendor?) I think that is the name...is a current O/D after market unit that has a lot of following these days.
Bill