For anyone interested, there is a bunch of truck data and options info in this 1966 Chevy resource document. If I read it correctly, the air over hydraulic brakes (AOHB) were an option for this C60 model. The 366 Big Block was also optional for the C60. There is also a chassis diagram showing the 5-10 wheels. wink

~ Dan
1951 Chevy 3 window 3100
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"My Grandpa Carl's Truck and How it Became Mine"
1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver)
US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)