The 3 reverse speeds, I didn't quite get that part either, because I was trying to figure out my own transmission, which is a 6 speed with reverse, and you just end up mutiplying the gears times 2 because of the transfer case. I was just thinking of the most legit reason possible for what was stated by Heston in the film. On one website, I saw mention of a 2 speed reverse, and the 2nd sped was for winter driving which would be like starting a car in "2" instead of "D". This means more torque and less slipping UNLESS traction is finally broken, then the tire actually spinsd faster.
Many people don't realize exactly how a transmission works. While "1" actually is first gear and remains in first gear, and "D" starts in "1" shifts to "2", and the "D" or "OD", when you shift into "2", it actually skips "1" and starts in "2" and remains in "2". It's a winter mode slippery conditions gear.
Sorry to get so involved, but it appears a LOT of people have no clue about cars seeing this day and age is mostly automatics with all electronic gadgets for traction and most vehicles no longer have a transfer case when it comes to "all wheel drive" which seems to have replaced 4wd.
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