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Ya, It has 2 gears, 1.1 and an overdrive, so you could shift 1st, 1st overdrive, 2nd, 2nd overdrive, 3rd, 3rd overdrive, 4th, 4th overdrive. I dont know why anybody would need that tho.
It would definitely save some RPM's and $$$ on the highway. But I doubt it would ever pay for itself. Probably take like 10 years, even with the cost of fuel these days.