A 1955 serial number will start with 152Y. A 1956 number will start with 152X.

A 1955 originally came with a 248, a '56 with a 270.

ref. http://www.oldgmctrucks.com/photos/SN_150_Series_YXTS.jpg


"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.