Are ya sure it says Wilson?? Most of the truck aux. trans. are Brownlite (brownie) or Watson..
When I learned 40 some years ago as a kid, the guy that taught me to used to thump me if I used the clutch for more than starting, stopping or backing..
I still drive for a living and just shift by the sound..
I found a 4spd overdrive with a mint shift tower and drive lines for $100 a year ago and put it in my 49 4400..its the working work in progress in the gallery..I just leave the 2 spd in high range..