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OK, one more thought:
One engine, One transmission, Two output sprockets, each feeding one side of a Spur Gear Differential, with dogs on the front sprocket of one side able to disengage that side, and a disc brake caliper on the rear sprocket of thet side to hold that side shaft from turning when the front sprocket is disengaged. Differential feeds rear wheel by sprocket on the carrier case.
Speed in ratios would be:
Left/Right Feeds-------Final Ratio--Top Speed
1/1-----------------------13.990 --- 47 mph
2/2 ------------------------9.540 --- 69 mph
3/3 ------------------------7.450 --- 88 mph
1/Disengaged, braked ---6.995 --- 94 mph
4/4 ------------------------6.140 -- 107 mph
5/5 ------------------------5.260 -- 125 mph
2/Disengaged, braked ---4.770 -- 138 mph
3/Disengaged, braked ---3.725 -- 176 mph
4/Disengaged, braked ---3.070 -- 214 mph
5/Disengaged, braked ---2.630 -- 250 mph
I have not taken into consideration Differential Ratio, but that can be handled
by choosing proper larger front/smaller rear sprocket pairs.
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