I think this may be an old State, municipal or other gov't unit. First here's what I'm pretty sure of;
A. BID C-66-201 is in reference to a bid from the agency that first aquired it. The second number is the VIN number.
B. The C4 tranny is a GM CH-465 4 speed I'll bet.
C. If it is a 2 speed rear there is a push/pull vacuum switch on the shift lever. Also a vacuum chamber sticking out of the pig on the diff.
D. WB-157 is 157" wheelbase and CA-84 is cab-to-axle dimension of 84". Just right for a 10' dump body or a 12' stake/platform/van body.

The 19,500 GVWR is the same as a current F550 F^#%. Likely has a 5K front with a 15K rear axle on 8:25x20-10PR rubber. The 15K rear was the smallest of the 2 speed rears. You may still find a line setting ticket bill of materials inside the glove box door.

Is this an old Alabama Dept of Highways truck? Bet it has a 292-I6 in it?

1953 Chevy 5-window 3100
In the Stovebolt Gallery
More pix on Picturetrail

Dave
Engine & Driveline Moderator

If you can't make seventy by an easy road, don't go. ~~ Mark Twain