OD switch on a 1947 GMC?

[joedoh]

bought a not running 47 GMC today, so I cant try the switch out, but it has three positions (all the way in and two clicks out) it looks like this:


took a bad picture of the trans too. (has a PTO for a hydraulic dump bed cylinder)



what I noticed right away was the universal joint on the trans. its a 3/4 ton truck but my 49 3600 had a torque tube for about 3 ft off the trans before the open driveline.

any ideas? its being delivered tomorrow so I can get more pictures.