The fourth generation of the famous American car brand didn't match those of earlier editions. Nevertheless, the Mustangs from these years now are getting some respect from car collectors. Here are specifications and other information for the 1971, 1972, 1973 Mustang:

 

Specifications for the 1971, 1972, 1973 Ford Mustang:
Wheelbase, inches: 109.0
Length, inches: 187.5-190.0
Curb-weight range, pounds: 2,907-3,261 (1971); 2,995-3,216 (1973)
Width, inches: 75.0

Engine Types for the 1971, 1972, 1973 Ford Mustang:
I-6: 250 cubic inches; 145 horsepower
V-8: 302 cubic inches; 210 horsepower
V-8: 351 cubic inches; 240-330 horsepower
V-8: 351 cubic inches; 168–275 (net)* horsepower
V-8: 429 cubic inches; 375 horsepower
*Starting with model-year 1972, engine output was measured with all accessories attached and stock intake and exhaust systems in place, resulting in a "net" horespower rating.

Transmissions for the 1971, 1972, 1973 Ford Mustang:
Automatic: 3-speed
Manual: 3-speed, 4-speed

Model-Year Production for the 1971, 1972, 1973 Ford Mustang:
1971: 149,678
1972: 125,093
1973: 134,867

Base Prices for the 1971, 1972, 1973 Ford Mustang:

Model	1971	1972	1973
Coupe, I-6	$2,911	$2,729	$2,760
Fastback, I-6	$2,973	$2,786	$2,820
Convertible, I-6	$3,227	$3,015	$3,102
Grand coupe, I-6	$3,117	$2,915	$2,946
Coupe, V-8	$3,006	$2,816	$2,897
Fastback, V-8	$3,068	$2,873	$2,907
Boss 351 fastback	$4,124	--	--
Convertible, V-8	$3,320	$3,101	$3,189
Grand coupe, V-8	$3,212	$3,002	$3,088
Mach 1 fastback	$3,268	$3,053	$3,088