1971 Mustang General Information

The 1971 Mustang became known as the Big Body Mustang! Lee Iacocca once called it a "fat pig". However the car had to gain width and length to accommodate the new 429 big block being offered in the new 1971 models. Over 400 pounds were added in the course of one year! If you did not order the 429 engine, the smaller engines were quite strained by the increase in weight and size.

The rear window sloped at a very low angle so rear window slats were no longer offered. Probably because if you put slats on the rear window your view would be blocked. Also, because you set low in the seats, it was hard to see over the Long hood and rear end.

The design was mocked up by Gail Halderman and shown to Ford's then president "Bunkie" Knudsen in February of 1968. Bunkie liked the design and approved it. Sad news however because of his racing and performance tastes, he was removed from office. It seems like the upper echelon didn't share his tastes and were caving in to the Mustang II design being readied for 1974.

It seems like the car manufacturers and the government were deciding what we the drivers wanted. Iacocca hated the 1971-73 series cars and was eager to build the smaller underpowered cars of the 1974 - 83 era.

Two new options were introduced in 1971. Power windows and rear window defroster were offered. The deluxe interior on the Mach 1 was not standard this year. If you wanted the upgrade, you had to buy it at a price of about $130. The Ram air hood was a no cost option on the 302-2V Mach and standard on the 351-2V and up. The only way to get the hood locks from the factory was to order Ram Air, which was available on 351-4V and up engines. If you ordered the top of the line 429 ram air package, you got the functional hood scoops, all others got a simulated hood scoop. Functional scoops were also offered as on option with the 351 engine.

A competition suspension was available to all cars except ones with the 250 cid 6 Cylinder. It came standard on all Mach 1's. This package consisted of: heavy duty shock absorbers, Heavy duty springs as well as front and if the engine was a 351 4v or large also rear stabilizer bars and staggered shocks. The cars were also equipped with a variable ratio (15.7 to 1) power steering unit.

Vehicle Identification Guide

PDF Format

Courtesy of 7173Mustangs Member: cobra3073

1971 Mustang Production Data

Body Style # Produced
63D 2 Door Fastback 23,956
65D 2 Door Hardtop 65,696
76D Convertible 6,121
63F Mach 1 36,499
65F 2 Door Grande 17,406
Total 149,678

There were 1,806 Boss 3351 mustangs included in the above table.

1971 Mustang Data Plate Decoder

Mustang Data Plate

Deciphering Veh Ident Numbers for the 1971 Mustang

1 F 01 F 1 0 0 2 0 0
Year 1971 Assembly Plant Body Code Engine Code

Consecutive Unit Number

Model Year
Code Description
1 1971

Assembly Plant
Code Description
F Dearborn
R San Jose
T Metuchen

Body Serial Code
Code Description
01 Hardtop
02 Sportsroof
03 Convertible
04 Grande
05 Mach 1

Engine Code
Code Description
C 429-4V
F 302-2V
H 351-2V
J 429-4V Ram Air
L 250-1V
M 351-4V
Q 351-4V Ram Air
R 351-4V Boss

Body Style Code
Code Description Code Description
Sportsroof, w/ Standard Interior, Buckets
Mach 1, Buckets
Coupe w/ Standard Interior, Buckets
Grande, Buckets
Convertible w/ Standard Int., Buckets

Exterior Paint Code
Code Description Code Description Code Description
A or 9A
Raven Black
B or 2B
Maroon Met.
C or 6C
Dark Ivy Green Met.
D or 3D
Grabber Yellow
E or 4E
Yellow Gold
Grabber Lime
J, 3J, J9
Grabber Blue
M or 5M
Wimbledon White
N or 4N
Pastel Blue
P or 4P
Med. Green Met.
Light Pewter Met.
Z or Z9
Grabber Green
3 or 3B
Bright Red
5 or 5A
Med. Brown Met.
6 or 6E
Silver Blue Met.
Light Gold

Interior Trim Code
Code Description Code Description
Black, all Vinyl
Med. Blue, all Vinyl
Vermillion, all Vinyl
Med. Ginger, all Vinyl
Med. Green, all Vinyl
White, all Vinyl
Med. Blue, Cloth and Vinyl
Vermillion, Cloth and Vinyl
Med. Ginger, Cloth and Vinyl
Med. Green, Cloth and Vinyl
Black, Knitted Vinyl
White, Knitted Vinyl
Black, Cloth and Vinyl
Med. Blue, Cloth and Vinyl
Vermillion, Cloth and Vinyl
Med. Ginger, Cloth and Vinyl
Med. Green, Cloth and Vinyl
Black, Knitted Vinyl
Med. Blue, Knitted Vinyl
Vermillion, Knitted Vinyl
Med. Ginger, Knitted Vinyl
Med. Green, Knitted Vinyl
White, Knitted Vinyl
Black, Knitted Vinyl
Med. Blue, Knitted Vinyl
Vermillion, Knitted Vinyl
Med. Ginger, Knitted Vinyl
Med. Green, Knitted Vinyl
White, Knitted Vinyl

Axle Ratio Code
Code Description Code Description
2.75:1 Standard Differential
2.79:1 Standard Differential
2.80:1 Standard Differential
3.00:1 Standard Differential
3.25:1 Standard Differential
3.50:1 Standard Differential
3.07:1 Standard Differential
2.75:1 Locking Differential
2.80:1 Locking Differential
O or 0
3.00:1 Locking Differential
3.25:1 Locking Differential
3.50:1 Locking Differential
3.91:1 Locking Differential
4.11:1 Locking Differential

Transmission Code
Code Description
1 3 Speed Manual
5 4 Speed Manual
6 4 Speed Manual Close Ratio
U C-6 Automatic
W C-4 Automatic
X FMX Automatic

District (DSO) Code
Code Description Code Description Code Description
11 Boston 12 Buffalo 13 New York
14 Pittsburgh 15 Newark 21 Atlanta
22 Charlotte 23 Philadelphia 24 Jacksonville
25 Richmond 26 Washington 31 Cincinnati
32 Cleveland 33 Detroit 34 Indianapolis
35 Lansing 36 Louisville 41 Chicago
42 Fargo 43 Rockford 44 Twin Cities
45 Davenport 51 Denver 52 Des Moines
53 Kansas City 54 Omaha 55 St. Louis
61 Dallas 62 Houston 63 Memphis
64 New Orleans 65 Oklahoma City 71 Los Angeles
72 San Jose 73 Salt Lake City 74 Seattle
81 Ford of Canada 83 Government 84 Home Office Reserve
85 American Red Cross 89 Transportation Services 90-99 Export

Consecutive Unit Number
Each plant started each year with number 100,001. The Ford, Mustang, Torino, T-Bird, and Maverick were all numbered together, regardless of model or type.

Fluid Capacities

Model Engine Oil Transmission (pts to add after draining) Axle Gas tank Cooling system
3 Spd 4 Spd Auto Qt. w/ heater with AC
6 - 250 4.5 3.5 - 18 4 20 11 11
8 - 302 5 3.5 - 18 4 20 15 15.5
8 - 351 5 3.5 4 22 5 20 15.5 16
8 - 429 7 - 4 26   20 19.5 19.5

Boss Cars

The Boss 351 replaced the previous Bosses and became known as the performance Mustang. There were 1,806 of these special cars made.  They came with very few options, including:

  • Boss engine,
  • ram air,
  • 3.91 rear axle,
  • traction-loc,
  • 4 speed manual transmission,
  • competition suspension,
  • Front power disc brakes
  • Front spoiler,
  • Mach 1 front grill
  • Mach 1 lower body side paint
  • 351 decals and tape treatment,
  • Chrome front bumper
  • Hood that was mostly blacked out.
  • 15x7 wheels and chrome trim rings
  • Goodyear F60x15 RWL tires