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1966 Mustang
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1966 Mustang and Shelby Information

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2016 Mustang and Shelby Information

The 1966 Mustang body was almost identical to the 1965 Mustang.   Because of the extremely high demand for the cars, Ford could barely keep up with demand by running full speed in three assembly plants.  Therefore, few changes were made between the early '65s and the late 1966 Mustangs. Most body panels are identical. There are some parts that look identical between the early 65's and the late 65's, but they are somewhat different. The front headlight buckets and hood are different. Other differences are in electrical and running gear parts. However, between the late '65 Mustangs and the '66 Stangs, most all parts are interchangeable. The grille on the 1966 consisted of a series of horizontal chrome bars and in the center was a running horse in a corral. The horizontal and vertical bars were removed. On the side of the car, back where the faux air scoops were, they changed the "C" scoops to a three finger side marking. The gas cap was changed in 1966 and a $76 vinyl roof was offered. Between 9 & 10 percent of the Mustangs were equipped with a vinyl roof. The padded sun visors became standard in 1966.

The standard engines in 1966 Mustangs were the 200 CU, in-line six cylinders.  They had a 9.2:1 compression ratio, hydraulic lifters, and 120 horsepower at 4400 rpm. Carburetion was an Autolite single barrel carburetor number C60F 9510-AD. If you ordered the sprint package, a chrome air cleaner topped off the carburetor.

The optional V-8s in 1966 were the 289ci 2bbl engine rated at 164 hp engines and then the 289ci 4bbl 210 hp engine. and the 289 HiPo engine rated at 271 horsepower.

The 289 2bbl engine produced 200 horsepower with the use a an Autolite 2100 2bbl carburetor. Valve sizes in all the 289 engines were identical.

The 289 4bbl engine produced 225 horsepower through the use of higher compression heads and a 4 barrel carburetor.

The 289 HiPo engine had solid lifters, a different low resistance exhaust manifold, and higher compression.  If you bought the HiPo engine, you had to get the 4-speed transmission.

The default transmission was the 3 speed.  However for a few measly dollars more one could buy either an automatic transmission or a 4-speed manual tranny. Most cars in 1966 were ordered or equipped with the Cruise-O-Matic transmission. The second most ordered transmission was the standard 3-speed. 4-speed transmissions were the rarest transmissions ordered in 1966.

Interiors for 1966 consisted of the standard or plain Jane interiors, which by standards of the day were still fancy and the deluxe interior decor group became known as the Pony Interior. The pony interior as in 1965, had embossed ponies running across the back of the seats, and a 5 cluster instrument panel which was standard in 1966. The fastbacks had 2 seats in the front and a fold down seat in the  back. Fastbacks were also were available with the deluxe interior option.  However, fastbacks only received the running horses on the front seats, the back seats were plain. The below dash ($311.00) air conditioner was a seldom ordered option. Wood grain steering wheels were priced out of the market as well. Consoles were a often ordered item and automatic transmissions priced at about $176 were ordered on about 63%of all 1966 Mustangs.

Mustang seats have a woven pattern whereas the 1965 seats were smooth. The 1966 fastback has a new and different style of seat latch for the folding rear seat option. The inside door panels have a horizontal line pattern opposed to the vertical pattern found on the '65 models. Door handles and window cranks remain unchanged

The interior decor group was consisted of: A five dial instrument cluster with full instrumentation, brightly trimmed pedals, walnut looking deluxe steering wheel, vinyl covered quarter trim panels, bright trim cap on hardtop quarter trim panel, courtesy lights in doors, galloping pony embossed seat covers, molded door panels with pistol grip door handles, wood grain glove compartment door, wood grain appliqu├ęs on instrument panel, kick panels with half carpeting and stainless trim. Most "Decor group" packages were ordered with a center console however it was not part of the package and did cost extra.

The GT option was again offered in 1966 it consisted of; manual front disc brakes, grille mounted fog lights, with grill bar, GT gas cap, F70x14 tires, GT rocker paint stripes, GT side emblems, special exhaust trumpets protruding through the rear valance, Special handling components, Standard 5 gauge instrument cluster. An additional option was the Rally-Pac.  There were two styles made, one for the 5 dial instrument cluster and one for the 4 dial instrument cluster.  These original Rally-Packs are few and far between.  Finding an original one today is a rare find indeed.

A special handling package was available for the 200 and 225 hp Mustangs.  Since it was included with the GT group, all 271 hp engines already had this installed by default. The special handling package consisted of; Increased rate front and rear springs, Heavy duty shock absorbers, 22 to 1 steering ratio and larger diameter front stabilizer bar.  HiPo cars received a 9 inch differential with gear ratios of either 3.89 or 4.11 to one. Hi performance vehicles received 15.5 inch wheels and 5.90x15 tires.

All early Mustang six cylinder engines had a 4 lug 4.5x13 inch wheel and 13x6.5 tires. Optional tires were 7.00x13 white wall tires. V8 cars could order an optional 14x 14.5 rim and 6.50x14 tires. All 8 cylinder engines used 5 lug pattern on their rims. Starting in 1965, V8 cars standard rims were the 4.5x14 and use 6.95x14 tires, 15x5 wheels were an option and used 5.90x15 tires. The 15 inch option was dropped and late hi performance cars used 14 inch rims and dual red line sidewall tires.

The GT Package

1966 Mustang GTs were very different from the regular cars. They also had many factory modifications that are hard to duplicate after production. Because different plants produced Mustangs in different ways, not all rules are firm and fast. but there are some of these rules that must be met!

The very basic rule is that every GT must be either a "K" code car or an "A" code car built after mid February 1965, no exceptions. The GT must have a dual exhaust system with exhaust trumpeters that exit through a special rear valance with 2 exhaust openings. Because of these exhaust openings, the rear bumper guards were omitted. The bracket bolt holes were sealed with small rubber plugs. To accommodate the dual exhaust, special exhaust hangar reinforcements were used on the rear hangars behind the rear seats.

The GT's exterior had a small GT badge on each front fender and GT stripes that ran from the rear of the front wheel well to the front of the rear wheel opening. They did not receive the standard M U S T A N G or M U S T A N G 2 + 2 emblems so there should not be any holes drilled and patched from these. Rocker molding were deleted and not an option. 1966 Mustang GT's received a special GT gas cap.

The front of the car received a set of fog lights mounted on horizontal bars. The will be two holes punched in the front of the radiator support for the wires to run through. There will be a fog light circuit breaker and a fog light switch that is mounted inside the car. There are several locations where the switch was mounted so that is not a determining factor. One thing is that whenever the fog lights are turned on, the taillights also come on. After market switches do not have this option.

There will be no little "C" side scoop ornamentation on a GT.

Mechanically speaking, the GT was built with a 16:1 quick ration steering gearbox. They had a stiffer suspension and heavier (thicker) front sway bar. Gt's received heavy duty shock absorbers. Along with the beefed up suspension, GT's were equipped with a larger single master cylinder, a proportioning valve, disc brakes and a brake pedal that was labeled "Disc Brake".

The interior received the standard 5 dial analog instrument cluster and standard glove box door in camera case black.

High Country Special (HCS)

In 1966, Ford started a special run of cars to be delivered to only the Denver DSO. The only things special about these cars is their colors and a special brass shield that was attached to the front fenders above the word Mustang. Only three colors were available on the HCS Columbine Blue (kind of a dark robin's egg blue color), Aspen Gold or Timberline Green. However, these were special colors and not available on any other Mustang. There were only 333 cars made, of that number 274 were coupes,20 were fastbacks, and 39 were convertibles,

The cars were pretty much like all other Mustangs produced in 1966, they were all body styles, and any engine /transmission options that were available. If you are looking for one of these, they were built only in San Jose Plant, have a date code of 15G , and have a six digit DSO code that started with 51 02nn. They were shipped by train to Denver where they were re-shipped to dealers in Colorado, Nebraska and Wyoming. So they are not just found in Colorado but in any state that worked out of the Denver DSO. I have never seen one other than in pictures and hove no pictures to share of one. If you have a HCS and want to share a picture, please send it in and I will post it.

Vehicle tag information

This link will take you to a page which contains the VIN tag information for all years of Mustangs. Previously this information appeared on each Mustang's year page, but consolidating it has significantly reduced page loading times.

Production numbers


Body Style Plate codes # Produced
63A 09 2 Door Fastback 27,809
65A 07 2 Door Hardtop 422,416
76A 08 Convertible 56,409
63B 09 2 Door Fastback Luxury 7,889
65B 07 2 Door Hardtop Luxury 55,938
76B 08 Convertible Luxury 12,520
76C 08 Convertible Bench Seats 3,190
65C 07 2 Door Hardtop  bench seats 21,397
Total 607,568


Wheel Base 108
Track Front 56
Track Rear 56
Width 68.2
Height 51
Length 181.6
Curb Weight 2,860
%Frt/% Rear 53/47
Misc. 289


Engine Choices

Code ci Bbl HP
T 200 1 120 1 V
C 289 2 200 289 CI 2 V
A 289 4 225 4v Premium
K 289 4 271 4V High Performance



Pricing and Options

Base Car Prices

Basic Coupe 2,320.96
Convertible 2,557.64
2+2 Fastback 2,533.19

Engine Options

289 ci V8 2bbl Challenger 105.63
289 ci V8 4bbl Challenger 158.48
289 ci V8 4bbl 271 hp Challenger without GT package 327.92
289 ci V8 4bbl 271 hp Challenger with GT package 276.34

Transmission Options

Automatic Transmission 6 cylinder 113.45
Automatic Transmission 8 cylinder (NA 271 hp) about 62% of the 1966 mustangs came with the auto trans with 6 or 8 cylinders 184.02
4 speed manual 6 cylinder 113.45
4 speed manual V8 184.02

Brakes, Steering & Rear Axle Options

Power brakes (NA 6 cyl) 42.29
Power Steering 84.48
Limited Slip differential (N.A. 6 cylinder) 41.60
Manual front disc brakes ( 8 cylinder only) 56.77

Performance Packages

Special handling package (200 & 225 hp engines) 30.64
GT Package (225 & 271 hp V8s only) 165.03
Styled steel wheels 14 inch (8 cylinder only) 119.71

Interior Options

OPTION Dollars
Interior decor group 107.08
Emergency flashers 19.19
Padded sun visors (fastback & convertibles) 5.58
Rear seat belts 14.78
Front retractable deluxe seat belts 7.39
Deluxe seat belts Front & Rear w/ front retractable 25.40
Visibility group -Remote control mirror, day/night mirror & 2 speed windshield wipers 35.83
Console without A/C 50.41
Console with A/C 31.52
Air conditioner - only 9.5% of the 1966 cars opted for this option 277.20
Tinted glass with banded windshield 30.25
Tinted banded front windshield only  21.09
AM radio with antenna 57.51
Deluxe steering wheel 31.52
Delete for credit Heater (31.52)
Seat belts - Delete (10.76)

Exterior Options

Power Convertible top 52.95
Accent group (fastback & convertibles) includes body side paint stripes, lower rocker molding 27.11
Accent group (hardtop) includes body side paint stripes, lower rocker molding 13.90
Back-up lamps 10.47
Heavy duty battery 7.44
Closed emission system (mandatory in California) 5.19
Rocker panel molding (Convertibles & fastbacks) Not available on HiPo cars 15.76
Vinyl roof (hardtops) - Only 9.5 % of the Mustangs (all hardtops) were ordered with vinyl roofs. 74.19
Knock off wheel cover hubs 17.82
14" Wire wheel covers 44.83

All regular production Mustang options are available with the hp engine except:

All regular production Mustang options are available with the GT package except: