On the Stovebolt forum on the Driveline discussions is a post by "Duggan" wanting a Transmission I.D. His picture shows a gear box with a single lever IN FRONT of the transmissio. First he lables it as an overdrive then as a splitter. It could work as either or both. I drew up a few very crude engineering possibilites and settled on one I like but has no bearing on what is actually inside that mystery box. Mine would have a 28 tooth gear on the input shaft and a 19 tooth on the counter shaft (cluster) gear. At the other end of the cluster and on the output shaft would be gears with the same tooth count, this would give a 33% overdrive that was all mechanical. The same fork that engaged the OD could move a splined sleeve on the mainshaft to either couple or uncouple the input shaft from the output shaft to switch back and forth from OD to straight drive. If used with a torque tube the tube and driveshaft could be shortened the length of that auxillary box and one would have an OD with a closed torque tube rear end set up. A shift lever with some creative bends would be needed to clear a bench seat or a switch to buckets. I'd give about anything to be able to tear that thing apart and check it out.
Auxilery trans Thanks Evan. Pictures are a bit to dark to determine the OD but i have seen the setup before on YouTube http://www.youtube.com/watch?v=AFYqT8fwJzM ! Could the Oil tube arrangement have a recirculating function back to the gearbox or an external gearbox oil filter when truck whas used as towtruck ? http://s1225.photobucket.com/user/Duggan_Mahcrotch/media/truck%20pics/129A6560-9CC5-4DA3-B901-0812EB01E766-6686-00000DA8C38E7DB7.jpg.html#/user/Duggan_Mahcrotch/media/truck%20pics/129A6560-9CC5-4DA3-B901-0812EB01E766-6686-00000DA8C38E7DB7.jpg.html?&_suid=136592201165808568919232026042