GMC56,
Do you have an 8-cylinder or 6-cylinder engine?
On what side of the engine is the oil filter?
The following information is only a guess.
1018PY2103 (Serial number)
101 = 1/2 ton short bed
8 = 248 engine (or, maybe a V-8 engine?)
P = Pontiac, MI assembly plant
Y = 1955 2nd series
2103 = 1102th 1/2 ton short bed made that year
3-4-55 (back of block drivers site)
March-4th-1955
D236 (cilinderheads the 6 could be a five difficault to see)
D = April
23 = 23rd day
6 (maybe a 5) = 1956 (1955)
CA-55-5754 (Is the plate on the hydra-matic)
You might want to also join
the oldGMCtrucks.com discussion boards. The people over their will know how to decode your codes (and there are a few other members from the Netherlands).
Tim
