Allegedly the gears can be swapped between the different D-series transmissions with no problems. Possibly even the ring and pinion gears? I'm not sure on that.
Regardless, though, the best FE would come from the tallest gearing, which would be from the 1988-91 CRX HF transmission. That had not only the tallest individual gears, but also the tallest R&P that I know of in a D-series trans.
BTW, getting into the wrong gears has nothing to do with the gears or the synchros. It has to do with the gear shift linkage outside the transmission, or the shift rails and forks inside the transmission.
-soD
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