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1965 Mustang Bench Seat

In 1965, there were 2,111 Bench Seat Convertibles produced.  All other convertibles came with either standard interior (“76A”) or Pony interior (“76B”) bucket seats.  The Bench Seat Convertibles had a body code “76C” stamped on the left hand side, lower rocker panel.  Bench Seat Coupes were stamped with body code “65C”.

A Fastback was stamped “63A” or “63B”.  The code “A” was for standard interior and the code “B” was for Pony interior.  There were not any 1965 Fastbacks that left the factory with a bench seat.  I wonder why not?  The Coupes and Convertibles had them and the bench seat would have certainly fit in a Fastback as well.

Another oddity was that many 1965 Fastbacks have the rocker panel body code “65”, which is a Coupe body code.  The Fastback should have been given a “63” rocker panel body code.  The rocker panels are the same part, but somehow they were stamped incorrectly before assembly at the factory.

Things that make you go hmmmm…..

Difference between a 1969 Mustang Power Brake and Manual Brake Pedal Housing

1814aQuestion:  Can you tell me the difference between a 1969 Mustang pedal housing for the Power Brake and a Manual Brake? What about MT vs AT housings? Is the ’69 housing specific to the ’69 Mustang?

Answer:  The difference between a manual brake and power brake pedal housing is in the the mounting flange at the firewall.

Power brake boosters have threaded studs that protrude through the firewall and housing flange and are held on by 9/16″ nuts. Manual brake master cylinders use bolts that protrude through the firewall and screw into a threaded insert in the brake housing.

Housings that do not have the threaded inserts on the firewall flange are for power brakes. Housings that do have these threaded inserts are for manual brake applications.

As far as the MT vs AT, for a 1969 Mustang, there is usually not any difference between manual and automatic transmission housings. Sometimes there is a bolt-on clutch spring hook (depending on the Mustang year). The factory punched the same mounting holes in all of the Classic Mustang housings.

The longer power brake pedal does not swing from the same pivot point that a manual brake or clutch pedal swings from. The long power brake pedal swings from a bolt at the very top of the housing. All housings also have these holes.

1969 Brake and Clutch Pedal Housings

1964 1/2 Mustang 289 D Code 4V Engine

The D Code 289 Mustang engine with the Autolite 4 bbl carburetor is a rare engine.  It was only offered as an option in 1964 1/2 Mustangs dated March – September of 1964.  Some of the characteristics setting this rare engine apart from other early V8’s include:

  • The air cleaner decal was black, white and red in color (rather than black and orange).  It read “289 cubic inch 4-V premium fuel”.
  • The timing chain cover had three variations:  1. an oil filler neck;  2. a hole for an oil filler neck with a plug in it;  3. no oil filler neck or oil filler hole.
  • All D Code engines used an aluminum water pump.
  • D Code 289’s used an Autolite 4100 4V 1.08 Venturi carburetor.
  • D Code 289’s had 5 bolt holes for attaching the bell housing (later engines had 6 bolts).
  • Early D Codes utilized a generator and later D Codes utilized an alternator.

1969 1970 Mustang Holley Carburetor Applications

1969 1970 Mustang Holley Carburetor Applications and Identification

When restoring your Boss 429 or 429 CJ to concours condition, look for the original carburetors.  Here are the carburetors that were originally installed in these vehicles.

1969 Boss 429 with manual transmission and thermactor emissions

  • Used a 750 cfm Holley 4V with manual choke
  • Identification number stamped on the front of the carburetor should read C9AF-S
  • Part number is C9AZ-9510-S (CA-708)

1970 429 CJ with manual transmission and IMCO (with or without Air Conditioning):

  • Used a 715 cfm Rochester Quadra-jet 4V carburetor
  • Identification number stamped on the front of the carburetor should read D0OF-B
  • Part number is D0OZ-9510-B (CA-771)

1970 Boss 429 with manual transmission and thermactor emissions

  • Used a 735 cfm Holley 4V carburetor with manual choke
  • Identification number stamped on the front of the carburetor may read D0OF-S
  • Or, the identification number stamped on the front of the carburetor may read D0ZF-G (H, U or T) followed by AA, AB, AC or AD.
  • Part number is D0OZ-9510-S (CA-776)
  • Replacement carburetor part number is:  D0ZZ-9510-H (CA-781)

To GT or Not to GT

How do you tell if a 1965 or 1966 Mustang was a true factory GT or just a Dealer installed imposter?

There were 2 types of Mustang GT’s:  Factory GT and dealer installed GT equipment.  What is the difference?

Factory Mustang GT’s

Factory Mustang GT’s were equipped with the following:

  • “A” or “K” code 289 4V premium fuel engine
  • Reinforced rear floor pan for the GT exhaust
  • Extra hanger bracket inside the rear frame rail for the GT exhaust
  • Factory fog lights
  • Rocker panel trim that was deleted (there weren’t any holes in the rocker panels for the trim)

Dealer GT’s

Dealers installed original GT equipment because it was readily available if a customer requested it.  Dealer GT vehicles could have been equipped with the following:

  • May or may not have an “A” code engine
  • Could have any available transmission
  • Almost never had reinforced rear floor pans
  • Never had rear frame rail exhaust hanger brackets
  • May have factory fog lights, but chances are, the underdash wiring harness would not have been changed (it would have been modified instead).
  • In most cases, would have rocker panel trim.  If it was removed, there would be evidence of filled trim holes.
  • Could have any interior that the customer requested.

How to tell a true Mustang GT from an imposter:

  1. Pull up the lower cushion of the rear seat.  All GT’s (Coupe, Convertible or Fastback) should have a reinforced rear floor pan.  This was for the heavy duty GT exhaust hangers.  The factory installed an extra sheet metal plate in the location of the rear seat belt mounting area to provide extra strength to hold the GT exhaust.  Only factory GT’s have these.  Dealer GT’s did not.
  2. Feel inside the 3/4″ hole on the side of the rear frame rails, near the rear spring hanger for an extra bracket.  Factory GT’s had these brackets for the GT exhaust.  Dealer GT’s could not manually install these brackets.

Copyright 2007:  FastbackStack, LLC

1964 1/2 & 1965 Mustangs: What is the Difference?

The Classic Ford Mustang is an American beauty.  When you see a vintage Mustang, you can’t help but admire its stunning characteristics of one of the greatest American cars ever built.  The popularity of this classic automobile still holds true today.  Many may wonder about the first produced Mustangs and exactly what the difference is between a 1964 1/2 Mustang and a 1965 Mustang.

There actually aren’t any Mustangs that are stamped “1964”.  They all carry a “5” in the VIN number, designating a “1965”.  Mustang Coupe and Convertible production began in April 1964.  It is still unclear as to exactly when Fastback production started, but it appears to be sometime in the summer of 1964.

The first Coupes and Convertibles that were manufactured had the engine codes C, D, F, K or U.  When the early D, F and U engines were being phased out, the Fastback production was just beginning.

As the first Fastbacks rolled down the assembly line, some may have been outfitted with the last remaining early engines available.  Therefore, the first Fastbacks may have had engine codes D, F or U.  As production continued and these early engines ran out, engines with codes A, C, K and T were used.  The K code engine was available from 1964 up until 1967.

It can be difficult to prove a true 1964 1/2 Mustang, but any early Mustang with a D, F or U engine code is definitely a 1964 1/2 Mustang.  Mustangs with engine codes A or T are considered 1965’s.  Mustangs with the C or K code engine option could be either a 1964 1/2 or a 1965 Mustang.  It is important to check the build date on the door tag.  This date gives further information as to when the car was assembled.

There is also a “gray area” when explaining the differences between 1964 1/2 and 1965 Mustangs.  The very earliest 1965’s could have some of the 1964 1/2 parts installed on them.  These parts were put on 1965’s until the parts were phased out, similar to the engines being phased out.  Some of the unique characteristics of the first parts include the following:

  • HEADLIGHT EXTENSIONS AND HOODS:  The first manufactured headlight extensions had a beveled edge along the top.  The front corners of the hood skin remained un-pinched around the hood frame.  This un-pinched flange pointed straight down to fill a gap that was caused by the beveled headlight extension (1965 headlight extensions did not carry this beveled edge; therefore the hood skins were pinched).
  • RADIATOR CORE SUPPORT:  The first manufactured core supports had three long vertical slots near the battery (1965 core supports had four elongated oval slots).
  • HORN STYLE AND MOUNTING LOCATION:  The first manufactured Mustang horns were quite large and mounted down on the strut rod frame rails near the bottom inside corners of the radiator (1965 horns were considerably smaller and mounted on the core support near the top outside corners of the radiator).
  • FASTBACK REAR INTERIOR STEEL TRIM:  The first manufactured Fastback rear trim wrapped around the interior’s fiberglass panels.  This steel trim extended from under the rear window, around the fiberglass interior panels and stopped about 1 1/2 inches short of the door glass (1965 steel trim extended all the way to the door glass).
  • AUTOMATIC TRANSMISSION SHIFTER HANDLE:  The first manufactured AT shifter handles were quite small (1965 AT shifter handles are the same shape, but about 50% larger than the early ones).
  • PASSENGER SEAT:  The first manufactured passenger seats were not adjustable to move forward or backward.  There was not any sliding track mechanism on the mounting hardware (1965 passenger seats had full front to rear sliding adjustment).
  • SHORT CARPET:  The first manufactured carpet did not climb up the rocker panel.  It stopped at the rocker and had an embroidered edge.  The rocker was then covered with vinyl to match the interior (1965 carpet climbed up the rocker panel and was covered by the door sill plate).
  • FLOOR PAN:  The first manufactured floor pans had staggered seat belt mounting holes along the transmission tunnel for the front seats.  The passenger seatbelt mounting hole was the furthest forward to accommodate the non-adjusting seat.  These floor pans were not immediately phased out.  I actually have mid-year 1965 Mustangs with staggered holes (Most mid-year and later 1965 floor pans had evenly spaced seat belt mounting holes).
  • SEAT RISERS:  The first manufactured seat risers had a large oval cutout in the center.  (1965 seat risers had a solid top).

These are some of the differences that we have found.

Copyright 2007:  FastbackStack, LLC