Thanks,Mike! This G.M.C. I'm referring to,has a "bicycle Bell" type switch,Very similar to the 2-speed A.D. switches. this truck is equipped with juice brakes-No air-over-hydraulics. The switch is connected,(by vacuum lines),to the "power divider". Then,again,this is an early '50's G.M.C. Tandem 450. Kenneth is correct. The "power divider" resembles a transfer case,and the rear driveshaft goes over the top of the front axle,and connects to the rear axle at quite an angle. Probably a truck with a top speed of 40 M.P.H. This one was used as a dump truck in a quarry. Not much highway use for that truck.
Last edited by wetwilly5757; 02/15/2016 2:11 AM.
