1957 Chevy Big Truck VIN Decoder

1957 VIN – Model – Series Identification

RPO = Regular Production Options

Vehicle Serial Numbers

Example: 3B57F 103456
3B = Series*, 57 = Year, F = Assembly Plant,
103456 = Unit Number beginning with 100001 at each plant regardless of Series.
* = The letter “V” prefix to the Series designation will identify models equipped with optional V-8 engine.

	NOTE: Starting in 1957 ALL Series 4000 and 6000 model wheelbases are lengthened by 2-1/2 inches to provide

	for the use of larger size tires without causing interference between the wheel and the toe pan on extreme 

	turns.    This wheelbase change is accomplished by moving the front axle forward on the springs, shortening

	the front overhang.  Front fenders with wider wheel openings were also used.

	(S) = "Special" Model also available in this series.
(H) = "Heavy Duty" Model also available in this series.

	% = Optional Four Wheel Drive Equipment is available on these models; see RPO 690.
@ = Optional Tandem Axle Equipment is available on these models; 
for 8000 Series see RPO 682; for 10000 Series see RPO 467.

	Series 3000 = Light Duty
Series 4000 & 5000 = Medium Duty
Series 6000 = Special Medium Duty
Series 7000, 8000, 9000 & 10000 = Heavy Duty

	ASSEMBLY PLANTS:
A = Atlanta
B = Baltimore
F = Flint
J = Janesville
K = Kansas City
L = Los Angeles
N = Norwood
O = Oakland
S = St. Louis
T = Tarrytown
W = Willow Run

Rear Axle Identification (Chevrolet)
Example: AF 2 12
AF = Type, series and assembly Plant designation.
2 = Month.
12 = Day of month

Axle numbers are stamped on the front or top of the Carrier.

Rear Axle Identification (Eaton)
Specification Number is stamped on the Housing Arm.
Ratio and Serial Numbers are stamped on the Carrier

Front Axle Identification (Eaton)

 	Note:  Eaton Spec Numbers are stamped on the bottom LH side, the Serial Number is 
stamped on the bottom RH side of the I-beam.

Engine Serial Numbers (Loadmaster Excluded)
Example: F 101 H
F = Flint; T = Tonawanda.
1 = Year.
01 = Day of the Month.
H = Type and Series designation.

	Note: Engine Serial Numbers were discontinued.

AOHB = Air Over Hydraulic Brakes

Loadmaster Engine Serial Numbers (322 cu. in. V8, Buick)
Example: CS2 – 001234
CS2 = Source and Designation.
001234 = Unit Number starting with 001001.

Transmission Identification

Six Speed Automatic (Powermatic)
Series 6000 with 261 cu in engine = Red Plate Color
Series 50-60-70-8000 with 283 cu in engine = Yellow Plate Color.
Series 90-100 (exc. 8800 & 10800) with 322 cu in engine = Green Plate Color