F= Flint
05=May
15= 15th of May
D= 283 of either 1958,59 or 60

Mortec Tech says it was cast from 58-66

I don't see any listings for a "D" code 283 in 1964 which would explain the road draft tube!
Scott

Last edited by 48bigtrucks; 04/13/2010 2:13 AM.
Scott Ward

2 1948 1.5-ton Loadmasters
The red one and The snow pusher
1 1950 3100
1 1955.1 Chevy 6500
1 1954 Chevy 6500 2-Ton
1 1955 1st Series COE 5700
1 1963 K20 (454)
1 1964 C10 (350)
1 1951 1.5-ton Dump Truck
1953 and a 1956 Ford F800

Raising a teenager is like trying to nail Jello to a tree!