Revised 05-27-05


1957 VIN - Model - Series Identification

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RPO = Regular Production Options

Serial Numbers locations

*ENGINE* *TRANSMISSION*
V8 Numbers = Top of Right Hand Bank at the front.
6 Cylinder Numbers = On boss at the rear of the distributor
3-speed conventional, overdrive and 4-speed = rear face.
3-speed Heavy Duty = left side at rear.
5-speed = right side rear bottom.
Automatic = left side at rear.
*REAR END* *VEHICLE*

Series 3100 = front face.
All Other = top.

 

Forward Control = left hand side on steering column.
Flat Face Cowl = front face of cowl top panel.
All Other = body hinge pillar.

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.

 
Series Designation

Ton   Series

Wheel Base (in) Model Type
3A 1/2 3100 114 Flat Face Cowl Chassis, Cab Chassis%, Pickup%, Panel%, Suburban%, W/S Cowl Chassis & Cameo.
3B 1/2 3200 123.2 Cab Chassis%, Pickup
3C 1/2 3400 104 Forward Control
3D 3/4 3500 125 Forward Control
3E 3/4 3600 123.2 Flat Face Cowl Chassis, Cab Chassis%, Pickup%, Stake% & W/S Cowl Chassis
3F 1 3700 137 Forward Control
3G 1 3800 135 Flat Face Cowl Chassis, Cab Chassis%, Pickup%, Panel%,  Stake% & W/S Cowl Chassis
4A 1-1/2 4100 132.5 Flat Face Cowl Chassis, Cab Chassis, Stake & W/S Cowl Chassis
4B 1-1/2 4400 156.5 Flat Face Cowl Chassis, Cab Chassis, Stake & W/S Cowl Chassis
4C 1-1/2 4500 156.5 School Bus Chassis
5A 2 5100 112.6 Cab Chassis
5B 2 5400 136.6 Cab Chassis & Stake
5C 2 5700 160.6 Cab Chassis
5D 1-1/2HD 5100S 112.6 Cab Chassis
5E 1-1/2HD 5400S 136.6 Cab Chassis & Stake
5F 1-1/2HD 5700S 160.6 Cab Chassis
5G 2HD 5100H 112.6 Cab Chassis
5H 2HD 5400H 136.6 Cab Chassis & Stake
5J 2HD 5700H 160.6 Cab Chassis
6A 2 6100 132.5 Flat Face Cowl Chassis, Cab Chassis, Stake & W/S Cowl Chassis
6B 2 6400 156.5 Flat Face Cowl Chassis, Cab Chassis, Stake & W/S Cowl Chassis
6C 2 6500 174.5 Flat Face Cowl Chassis, Cab Chassis & W/S Cowl Chassis
6D 2 6702 196.5 School Bus Chassis
6E 2 6800 222.5 School Bus Chassis
6F 1-1/2HD 6100S 132.5 Flat Face Cowl Chassis, Cab Chassis, Stake & W/S Cowl Chassis
6G 1-1/2HD 6400S 156.5 Flat Face Cowl Chassis, Cab Chassis, Stake & W/S Cowl Chassis
6H 1-1/2HD 6500S 174.5 Flat Face Cowl Chassis, Cab Chassis & W/S Cowl Chassis
6J 2 6200 129.6 Forward Control
6K 2 6200 153.6 Forward Control
6L 2HD 6100H 132.5 Flat Face Cowl Chassis, Cab Chassis, Stake & W/S Cowl Chassis
6M 2HD 6400H 156.5 Flat Face Cowl Chassis, Cab Chassis, Stake & W/S Cowl Chassis
6N 2HD 6500H 174.5 Flat Face Cowl Chassis, Cab Chassis & W/S Cowl Chassis
7A 2-1/2 7100 112 Cab Chassis & Stake
7B 2-1/2 7200 124 Cab Chassis
7C 2-1/2 7700 172 Cab Chassis
8A 2-1/2 8100 132.5 Cab Chassis & Stake
8B 2-1/2 8200 144.5 Cab Chassis
8C 2-1/2 8400 @ 154.5 Cab Chassis & Stake
8D 2-1/2 8500 @ 174.5 Cab Chassis
8E 2-1/2 8700 @ 192.5 Cab Chassis
8F 2-1/2 8800 240 School Bus Chassis
9A 2-1/2 9100 112 Cab Chassis
9B 2-1/2 9200 124 Cab Chassis
9C 2-1/2 9700 172 Cab Chassis
10A 2-1/2 10100 132.5 Cab Chassis
10B 2-1/2 10200 144.5 Cab Chassis
10C 2-1/2 10400 @ 156.5 Cab Chassis
10D 2-1/2 10500 @ 174.5 Cab Chassis
10E 2-1/2 10700 @ 192.5 Cab Chassis
10F 2-1/2 10800 240 School Bus Chassis

	
	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.

Capacity (lbs) Type Ratio Series
3300 AF 3.90:1 31 and 32 Regular Production
3300 AG 4.11:1 31 and 32 with RPO 315
3300 AR 4.11:1 3100 with RPO 690
5000 CA 5.14:1 34-35-3700 Regular Production
5000 CB 5.14:1 34-35-37-3800 with RPO's 299-462
5000 CC 4.57:1 3600 Regular Production with RPO's 314-316-318
5000 CD 4.57:1 3600 with RPO 285
5000 CP 4.57:1 3600 with RPO 690
5000 CE 5.14:1 34-35-3700 with RPO's 316-318-321
7200 CF 5.14:1 3800 Regular Production, 34-35-3700 RPO 205
7200 CQ 5.14:1 3800 with RPO 690
11000 CG 6.17:1 4000 Regular Production
11000 CW 6.40/8.71 41-4400 with RPO 243
11000 CN 6.40/8.71 4500 with RPO 243
11000 CH 6.17:1 50-60-70-8000 (except 8800) RPO 251
15000 CM 7.20:1 50-60-70-80-10800
15000 CL 6.40/8.71 50-60-70-80 (except 62-6600) RPO 201 & 415
30000 DA 7.20:1 80-10000 with Tandem Equipment RPO 682 & 476 (rear)
30000 DB 7.20:1 80-10000 with Tandem Equipment RPO 682 & 476 (aux. rear)

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

Capacity (lbs) Spec Numbers Ratios Series
16000 S-9701 7.17:1 5000-61-64-6500
16000 S-9702 6.50/9.04:1 5000-61-64-6500
16000 S-9460 7.17:1 7-8-9-10000
16000 S-9461 6.50/9.04:1 7-8-9-10000
16000 S-9603 7.17:1 9-10000  10 Bolt
18000 S-9605 6.50/8.87:1 9-10000 10 Bolt
18000 S-9726 7.17:1 9-10000 Full Air
18000 S-9727 6.50/8.87:1 9-10000 Full Air

Front Axle Identification (Eaton)

Capacity (lbs) I-Beam Height (average) Spec Series
4500 2.51 S-9728 5000  
S-9703 6200-6600
7000 3.25 S-9095B 7000-9000.
7000 3.25 S-9059 8000-10000
S-9462 9000 10 bolt hub
S-9725 9000 (Full Air)
S-9463A 10000 (10 Bolt)
S-9724 10000 (Full Air)
9000 3.75 S-9705 Tandem (HD Option)
 	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.
Type Series Description
H 31-32-36-3800 Thriftmaster 235 with 3-speed (regular production)
HD 31-32-36-38-4000 Thriftmaster 235 with Hydramatic
HE 31-32-36-38-4000 Thriftmaster 235 with HD clutch
L 31-32-36-38-4000 Trademaster 265
LA 31-32-36-38-4000 Trademaster 265 with Hydramatic
LB 31-32-36-38-4000 Trademaster 265 with HD Clutch
J 34-35-3700 Thriftmaster 235 (regular production)
JA 34-35-3700 Thriftmaster 235 with Hydramatic
M 34-35-3700 Trademaster 265
N 5000 Taskmaster 283
NA 5000 Taskmaster 283 with Powermatic
NC 5000 Taskmaster 283 with 4BC
ND 5000 Taskmaster 283 with 4BC and Powermatic
K 6000 Jobmaster 261
KC 6000 Jobmaster 261 with Powermatic
P 6000 Taskmaster 283
PA 6000 Taskmaster 283 with Powermatic
PC 6000 Taskmaster 283 with 4BC
PD 6000 Taskmaster 283 with 4BC and Powermatic
R 7000 Taskmaster 283
RA 7000 Taskmaster 283 with Powermatic
RD 7000 Taskmaster 283 with AOHB
RE 7000 Taskmaster 283 with Powermatic and AOHB
RF 7000 Taskmaster 283 with 4BC
RG 7000 Taskmaster 283 with 4BC and Powermatic
RH 7000 Taskmaster 283 with 4BC and Powermatic and AOHB
RJ 7000 Taskmaster 283 with 4BC and AOHB
S 8000 Taskmaster 283
SC 8000 Taskmaster 283 with Powermatic
SD 8000 Taskmaster 283 with AOHB
SE 8000 Taskmaster 283 with Powermatic and AOHB
SF 8000 Taskmaster 283 with 4BC
SG 8000 Taskmaster 283 with 4BC and Powermatic
SH 8000 Taskmaster 283 with 4BC and Powermatic and AOHB
SJ 8000 Taskmaster 283 with 4BC and AOHB

           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.

CS2 9-10000 Loadmaster 322 V8
CA2 9-10000 Loadmaster 322 V8 with Powermatic
CS4 9-10000 Loadmaster 322 V8 with 4BC
CA4 9-10000 Loadmaster 322 V8 with 4BC and Powermatic

Transmission Identification
 

Three Speed Conventional and Overdrive
Example: M 2 28
M = Muncie; S = Saginaw
2 = Month
28 = Day of Month

Four Speed Syncro-Mesh
Example: T 2 28
T = Toledo
2 = Month
28 = Day of Month

 

Four Speed Automatic (Hydramatic)
Series 31-3200 = Orange Plate Color.
Series 34-35-36-38-4000 = Black Plate Color

Three Speed Heavy Duty
Example: W  B  28  2
W = Borg Warner
B = Month (February)
28 = Day of Month.
2 =  Shift

 

Three Speed Heavy Duty
Example: W  B  28  2
W = Borg Warner
B = Month (February)
28 = Day of Month.
2 =  Shift

 

Five Speed Syncro-Mesh (New Process)
Example: 2  28  7
2 = Month.
28 = Day of Month.
7 = Year

Five Speed Syncro-Mesh HD (Spicer)
Example: D  B  28  7
D = Manufacture
B = Month (February)
28 = Day of Month.
7 = Year.

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
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