The transfer case in your 1987 Chevy looks considerably different. Drivetrains in the WW2 era were kind of oddball. Both the front and rear differentials have identical parts, same ring and pinion for front and rear. To accommodate, the front axle pinion is mounter real high rotating the assembly the opposite direction as the rear with its low mounted pinion. Both front and rear transfer case output shafts rotate in the same direction.