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**1964-1968 Ford Motor Company DSO Codes**
Two-digit warranty plate numbers indicate District Sales Offices. Certain DSOs began and ceased operation in the middle of model years. Mustangs often carried a DSO code that was not officially in use until the next year.
Code	Years	Location
11	1965-1973	Boston
12	1965-1966	Buffalo
13	1965-1973	New York
14	1965-1966	Pittsburgh
15	1965-1973	Newark
16	1967-1973	Philadelphia
17	1967-1973	Washington DC
21	1965-1973	Atlanta
22	1965-1973	Charlotte
23	1965-1966	Philadelphia
24	1965-1973	Jacksonville
25	1965-1973	Richmond
26	1965-1966	Washington DC
27	1967-1968	Cincinnati
28	1967-1973	Louisville
31	1965-1966	Cincinnati
32	1965-1971	Cleveland
33	1965-1971	Detroit
34	1965-1968	Indianapolis
35	1965-1971	Lansing
36	1965-1966	Louisville
37	1967-1971	Buffalo
38	1967-1971	Pittsburgh
41	1965-1970	Chicago
42	1965-1968	Fago
43	1965-1966	Rockford
43	1967-1973	Milwaukee
44	1965-1971	Twin Cities
45	1965-1968	Davenport
51	1965-1971	Denver
52	1965-1968	Des Moines
53	1965-1973	Kansas City
54	1965-1973	Omaha
55	1965-1973	St. Louis
61	1965-1971	Dallas
62	1965-1971	Houston
63	1965-1971	Memphis
64	1965-1971	New Orleans
65	1965-1971	Oklahoma City
71	1965-1973	Los Angeles
72	1965-1973	San Jose
73	1965-1973	Salt Lake City
74	1965-1973	Seattle
75	1967-1973	Phoenix
81	1965-1968	Ford of Canada
83	1965-1973	Government
84	1965-1974	Home Office Reserve
85	1965-1973	American Red Cross
89	1965-1973	Transportation Services
90-99	1965-1973	Export

**Ford of Canada DSO Codes**
Code	Region
B1	Central
B2	Eastern
B3	Atlantic
B4	Midwestern
B6	Western
B7	Pacific

**1964-1968 Mustang Transmission Codes**
Code	Years	Transmission Type	Remarks
1	1965-1967	Three-speed manual	2.77:1
	1968-1973	Three-speed manual
3	1966-1967	Three-speed manual	3.03:1
5	1965-1967	Four-speed manual
	1968-1973	Four-speed manual	2.78:1
6	1965-1966	C-4 automatic
	1967-1971	Four-speed manual	2.32:1 Close ratio
U	1967-1973	C-6 automatic
W	1967-1973	C-4 automatic

**Mustang Warranty Plate Production Date Codes**
From 1965 to 1969, an alpha-numeric code above or below the word
"Date on the Warranty Plate identified the dat and months a vehicle was
scheduled to be built. A code of 17 K meant the 17th day of October.
As a rule, actual build dates were noted on underhood body buck tags.
Code	Month, First Production Year	Code	Month, Second Production Year
A	January	N	January
B	February	P	February
C	March	Q	March
D	April	R	April
E	May	S	May
F	June	T	June
G	July	U	July
H	August	V	August
J	September	W	September
K	Octoer	X	October
L	November	Y	November
M	December	Z	December

Note: At the beginning of Mustang production, in March 1964, the month codes started with C, D, E, and so on. In January and Febuary 1965, the letters A and B were used, but were followed by "Q" for March and the second year codes through August (V).

1965-1968 Mustang Warranty Plate Serial and Style Letters
Style Code	Years	Serial Code	Body Style	Interior design
63A	1965-1968	O2	Fastback	Standard interior, bucket seats
63B	1965-1968	O2	Fastback	Luxury interior, bucket seats
63C	1968	O2	Fastback	Standard interior, bench seat
63D	1968	O2	Fastback	Luxury interior, bench seat
65A	1965-1970	O1	Hardtop	Standard interior, bench seat
65B	1965-1970	O1	Hardtop	Luxury interior, bucket seats
65C	1965-1969	O1	Hardtop	Standard interior, bench seat
65D	1968-1969	O1	Hardtop	Luxury interior, bench seat
76A	1965-1970	O3	Convertible	Standard interior, bucket seats
76B	1965-1970	O3	Convertible	Luxury interior, bucket seats
76C	1965-1967	O3	Convertible	Standard interior, bench seat

1964-1968 Mustang Engine Codes
Code	Years	Engine	Remarks
A	1965-1967	289-4V
C	1965-1968	289-2V
D	1964-1/2	289-4V
F	1964-1/2 1968-1973	260-2V 302-4V
J	1968	302-4V
K	1965-1937	289-4V	271hp Hi-Po engine
R	1968-1970	428-4V	Ram Air Cobra Jet
S	1967-1969	390-4V
T	1965-1969	200-1V
U	1964-1/2	170-1V
W	1968	427-4V	One is known to exist
X	1968	302-2V	Uncommon; AT only

1964-1968 Mustang Rear Axle Ratio Codes
Code	Years	Axle Ratio	Remarks
0	1967	2.79:1
1	1965-1967 1968	3.00:1 2.75:1
2	1965-1967 1968	2.83:1 2.79:1
3	1965-1967	3.20:1
4	1967 1968	3.25:1 2.83:1
5	1965-1967 1968	3.50:1 3.00:1
6	1965-1967 1968	2.80:1 3.20:1
7	1968	3.25:1
8	1965-1966 1968	3.89:1 3.50:1
9	1965-1966 1968	4.11:1 3.10:1
A	1965-1967	3.00:1	Limited Slip
B	1965-1966	2.83:1	Limited Slip
C	1965-1967	3.20:1	Limited Slip
D	1967	3.25:1	Limited Slip
E	1965-1967 1968	3.50:1 3.00:1	Limited Slip Limited Slip
F	1965-1966 1968	2.80:1 3.20:1	Limited Slip Limited Slip
G	1968	3.25:1	Limited Slip
H	1965 1968	3.89:1 3.50:1	Limited Slip Limited Slip
I	1965	4:11:1	Limited Slip

Assembly Plant Code:
Code	Assembly Plant
A	Atlanta
B	Oakville (Canada)
C	Ontario Truck
D	Dallas
E	Mahwah
F	Dearborn
G	Chicago
H	Lorain
J	Los Angeles
K	Kansas City
L	Michigan Truck
N	Norfolk
P	Twin Cities
R	San Jose
S	Pilot Plant
T	Metuchen
U	Louisville
W	Wayne
X	St. Thomas
Y	Wixom
Z	St. Louis

Consecutive Unit Number Mustangs, Falcons, and Fairlanes were assembled on the same assembly line beginning with #100001 each model year. Units were consecutively numbered regardless of model with various assembly plants receiving blocks of numbers. Therefore occasionally you'll find a vehicle with a relatively low consecutive unit number yet the date code indicates an assembly date far later in the model year.

This information for the 1964-1/2 through 1973 mustang codes was taken from a book by Tom Corcoran. Copyright 1993, Tom Corcoran. Published by Motorbooks International Publishers & Wholesalers, Osceola, WI 54020 USA. H O M E