Here's the way your numbers break down...
Engine ADCA59217
ACDA = 1946 Series 3600/3800, 216 built in Flint.
59217 = unit number starting at 1001, so you have the 58,217th 1946 engine built in Flint.
Body/Chassis 5DRC3674
5 = Kansas City Plant
DR = 1946 3/4 ton with 125" wheel base.
C = month (March)
3674 = unit number starting at 1001, so you have the 2,674th 1946 unit built in Kansas City.
Hope this helps,
Mike B
