I am posting this for additional reading on the subject of planetary over/under drive units.
I'm not suggesting this as a possible solution.
The
HONE-O-DRIVE is and axle mounted planetary over drive.
I actually had a hone-o-drive unit in a 1970 cougar years ago , if I had only know how rare / expensive it was I would have kept it .
Apparently they are reproducing them.
it works on the same principal as carringb describes.
Quote:
Originally Posted by carringb
That all said... One workaround for a lack of off-the-shelf under-drives, is to go ahead with the Overdrive, combined with much lower gears. You'll get lower overall ratio needed for off-road driving, but still retain a reasonable top final-driving ratio for highway cruising.
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http://hone-o-
drive.com/hone-o-drive/