you do realize that 2 speed rear gearing is "high and higher"? usually the 2nd speed is a 'granny gear' to help with starting with heavy loads, not a better ratio for high speed use
"When we tug a single thing in nature, we find it attached to the rest of the world" ~ John Muir "When we tug a single thing on an old truck, we find it falls off" ~ me Some TF series details & TF heater pics