you'd need to modify a number of things to get it all to work, and 3.73 isn't a big gain over 3.90, you'd be better off to look at the 3.38 gearset offered by Patricks and others .... or change out the hydramatic for an OD 3 speed
"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