While it is still frozen up, this morning, I crawled under the dump truck for measurements and a few pictures of the driveshaft. Refer to my link below for updated pictures. Now for measurements;
the aux box is 27" long, (center to center of u-joints)
truck front u-joint to midship u-joint 29" (center to center)
midship u-joint to rear axle u-joint 50" (center to center)
OTHER NOTES:
You will see the mounting of the hydraulic pump, I can move it closer to the frame rail to allow for more space for the aux box
Alan