When you drive the 3W you'll see why they chose the 5-speeder, in a word 'torque'. Oodles of it and a torque spike of 1800 ft/lbs I believe, once moving you don't really need a gearbox that much...
Brian
1970 Morgan Plus 8 - Moss Box (Indigo Blue) 2014 Morgan SP1 (Rocket Red) 2015 Morgan Plus 8 (Rocket Blue)