C = Conventinal
M = V6 Engine
5 = GVW Series
03 = cab and chassis ordered
Z = Fremont Assembly Plant
1 = 1971
rest is sequence number of the line 52381
Reads like a 1971 GMC C50 truck to me.
And welcome to the 67-72 message boards.
__________________
Senior active founding member.
70 3/4 ton GMC Suburban 4x4 250/4 spd.
71 1/2 ton Suburban Chevy 4x4, 350/350
72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane
2005 FLSTSCI Harley Springer
85 FXSB Harley Lowrider
72 Triumph 650 Bonneville 5spd
"Poor people don't have hobbies" Quote from wife.
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