Topic: 66 Running Changes Main Thread - Dearborn Findings

[J_Speegle]

Like the other running changes threads I'm posting this thread as a place keeper of all the running changes for this year and plant so that we can have one main focal collection point. Like other ones we can propose a subject and then establish discussion threads for findings to develop and idea of when the change took place and what cars were affected by each. As members propose subjects they will be added to the list and the post will be deleted so that we don't get pages and pages of suggestions. Hope, like the other threads this will help us better understand these cars and production details

To keep the thread from getting too long or out of hand please don't post that you found this version or that on car 6R07C2345xx (for example). We can save that for the research period and for the individual change threads. Just trying to identify the features during this first effort. Will break out the findings by plant of course.  Hope we can work through other plants also

Drivetrain

Engine

E1- V8 motor mount style - Currently have the change possibly taking place in the 130xxx-140000 range MPC list the change being made on Nov 1 1965
       https://www.concoursmustang.com/forum/index.php?topic=25068.new#new -

E2- Hipo/K Code Alternator pulley and fan change -

E3- V8 Head design change -

E4- V8 Intake end gasket change -

E5- V8 Valve spring change (Engine #10 Change) -

E6- V8 Piston change. -

E7- V8 Valve cover change - BM reference

E8- Ignition coil marking - FoMoCo to AUTOLITE- Marking changed at the plant that supplied the coils somewhere between March and May 1966
       https://www.concoursmustang.com/forum/index.php?topic=2947.new#new

E9-

E10-

E11-


Transmission

TR1- Manual transmission clutch changes - numerous related changes (Reference 2/14/66)

TR2- 3 and 4 Speed lower shifter boot - Add to production approximately Feb. 16, 1966 
         http://www.concoursmustang.com/forum/index.php?topic=18346.new#new

TR3- Upper clutch release lever spring change - Spring, attachment bracket, Z bar.

TR4-

TR5-


Rearend

R1-  9"/K-code differential housing from round to hump -

R2-

R3-


Engine Compartment

EC1- Disc Brake Master Cylinder change - Change of brake line attachment and dating styles

EC2- Addition of an upper clutch spring firewall anchor bracket hole under master cylinder. MPC notes change incorporated at all three plants on Feb 16 1966.

EC3- Starter Solenoid - 
       https://www.concoursmustang.com/forum/index.php?topic=27543.new#new

EC4- 

EC5-

EC6-

EC7-
 
EC8-

EC9-

EC10-

EC11-

EC12-

EC13-

EC14-

EC15-


Exterior

EX1- Hood frame design changes -

EX2- Drivers side fender lip reliefs  (raised triangles). Took place (fender stamping date) from Jan 14-18th 1966 according to findings.
         http://www.concoursmustang.com/forum/index.php?topic=1399.msg119005#msg119005

EX3- GT Fender emblem change - Ceramic to plastic
         http://www.concoursmustang.com/forum/index.php?topic=20665.0

EX4-

EX5-

EX6-

EX7-


Interior

I1- 4 way flasher wire loom - Separate or integrated with dash loom -

I2- Heater case design change - Fresh air door. Left to right swing to bottom up swing.
       http://www.concoursmustang.com/forum/index.php?topic=22716.msg142374#msg142374

i3- Tire pressure decal location - Change from applied to the glove box door to applied to the back surface of the glove box liner
       https://www.concoursmustang.com/forum/index.php?topic=27534.0


Trunk

T1- Passenger side wheel well spare tire depression

T2- Fastback passenger side trap door surround panel - Use and application of the flat and dimpled panel. 
       https://www.concoursmustang.com/forum/index.php?topic=29488.0


Undercarriage

U1- Rear V8 brake cylinders from 29/32" to 7/8" -

U2- Rear backing plate knock-outs for brake shoe adjustment - Started during the last few months of 65 production so not a 66 change
         http://www.concoursmustang.com/forum/index.php?topic=15041.msg93741#msg93741



Last Updated - 3/18/2024