1/2T has a closed driveline and 4.11 gears in a semi-float axle - 3/4T has a full-floating axle, different gearing [4.57?] and brakes, and a 2 piece open driveshaft
"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