1967–1968

The 1967 model year Mustang was the first significant redesign of the original model. Ford's designers began drawing up a larger version even as the original was achieving sales success, and while "Iacocca later complained about the Mustang's growth, he did oversee the redesign for 1967." The major mechanical feature was to allow the installation of a big-block V8 engine. The overall size, interior, and cargo space were increased. Exterior trim changes included concave taillights, side scoop (1967 model) and chrome (1968 model) side ornamentation, square rear-view mirrors, and usual yearly wheel and gas cap changes. The high-performance 289 option was placed behind the newer 335 hp (250 kW; 340 PS) 390 cu in (6.4 L) FE engine from the Ford Thunderbird, which was equipped with a four-barrel carburetor. During the mid-1968 model year, a drag racer for the street could be ordered with the optional 428 cu in (7.0 L) Cobra Jet engine which was officially rated at 335 hp (250 kW; 340 PS) all of these Mustangs were issued R codes on their VINs

967–1968

The 1967 Deluxe Interior was revised, discontinuing the embossed running horse motif on the seatbacks (the source for the "pony interior" nickname) in favor of a new deluxe interior package, which included special color options, brushed aluminum (from August 1966 production) or woodgrain dash trim, seat buttons, and special door panels. The hardtop also included upholstered quarter trim panels, a carryover from the 1965–1966 deluxe interior. The 1967 hardtop also had the chrome quarter trim caps, carried over from 1965–1966, but these were painted to match the interior in 1968 models. The 1967 deluxe interior included stainless steel-trimmed seat back shells, similar to those in the Thunderbird. These were dropped at the end of the 1967 model year and were not included in the woodgrain-trimmed 1968 interior. The deluxe steering wheel, which had been included in the deluxe interior for 1965 and 1966, became optional, and could also be ordered with the standard interior. The 1968 models that were produced from January 1968 were also the first model year to incorporate three-point lap and shoulder belts (which had previously been optional, in 1967–1968 models) as opposed to the standard lap belts. The air-conditioning option was fully integrated into the dash, the speakers and stereo were upgraded, and unique center and overhead consoles were options. The fastback model offered the option of a rear fold-down seat, and the convertible was available with folding glass windows. Gone was the Rally-Pac, since the new instrument cluster had provisions for an optional tachometer and clock. Its size and shape also precluded the installation of the accessory atop the steering column.The convenience group with four warning lights for low fuel, seat belt reminder, parking brake not released, and door ajar were added to the instrument panel, or, if one ordered the optional console and A/C, the lights were mounted on the console

Changes for the 1968 model increased safety with a two-spoke energy-absorbing steering wheel, along with newly introduced shoulder belts. Other changes included front and rear side markers, "FORD" lettering removed from the hood, rearview mirror moved from frame to windshield, a 302 cu in (4.9 L) V8 engine option, and C-Stripe graphics were added

The California Special Mustang, or GT/CS, was visually based on the Shelby model and was only sold in Western states. Its sister, the 'High Country Special', was sold in Denver, Colorado. While the GT/CS was only available as a coupe, the 'High Country Special' model was available in fastback and convertible configurations during the 1966 and 1967 model years, and as a coupe for 1968.

The 1968 Ford Mustang GT Fastback got a popularity boost after it was featured in the 1968 film Bullitt, starring Steve McQueen. In the film, McQueen drove a modified 1968 Mustang GT 2+2 Fastback chasing a Dodge Charger through the streets of San Francisco.

On January 10, 2020, the car that was driven by McQueen, later owned by Robert Kiernan, and subsequently by his son Sean, was sold at Mecum Auctions for a record price of $3.7 million (~$4.29 million in 2023), including auction fees

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  1968 Convertible
 
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  1967 Fastback
 
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  1968 Mustang High Country Special Hardtop
 
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  Mustang GT/CS
 
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  1967 Shelby GT350
 
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  1968 Shelby GT350
 
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  1967–1968 front end style comparison
 
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  1968 Mustang from the Bullitt movie at the 2018 North American International Auto Show