Topic: Correct 4 Speed ?

[Brian Conway]

     My 65, San Jose, GT fastback has had a T-10, HEK-V, in it for decades.  I would like to ask you guys to help me out with what would have been the most likely assembly line transmission for this car.  I have posted a picture of the Door Warranty Plate.  I have the Dealerships Registered Owner Plan and that indicates the car was registered and picked up May 29, 1965.  My research indicates the correct trans. might be:
                       HEH-BX Close Ratio with a C4ZR-7A040 Tail shaft ?  Opinions ,corrections or suggestions please.

     The car has had a T-10 in it, to my knowledge, since at least 1968.  I have posted a picture of that HEK-V tag.   With the correct Toploader trans will I need to change the shifter rods ?  Thanks,  Brian
   

[CharlesTurner]

HEH-BX is the later K code transmission, introduced sometime in the '66 model year.

The correct toploader for the time period your car was made and used in an A or C code was an HEH-BT, which is a wide ratio.  As to whether or not the T10 is original to your car, guess you would have to inspect the T-10 case to determine any date markings. 

[rockhouse66]

My much later (9/65) San Jose car had a T-10 in it.  And yes, the shift rods are different between T-10 and Toploader.

[Brian Conway]

     Thank you guys.  My resources are limited so this input has been a great help.  The Mustang Tek site has the HEH-BT listed as a close ratio trans..  The 65 Shop Manual Has the HEH-P listed and the 66 Shop Manual has the HEH-BT listed as a wide ratio.  So I'll figure my, mid to late production, 65 car may have gotten the HEH-BT wide ratio trans.
     Jim's Sept. 65 car with the T-10 is great news.  I may not need to be looking for another trans and rods after all ?  The last time I tried to read the date stamp on the case was not a real success.  Got the middle number 2 clearly and that was all.  I'll have to give it another try. 

[CharlesTurner]

Yeah, the online resources are wrong that HEH-BT is a close ratio.  I had one and can tell you it was definitely wide ratio, counted the gear teeth to be sure.

[Brian Conway]

The T 10 in my 65 has a date code that I will need some help with ?  Thanks,  Brian

[CharlesTurner]

Check on the inspection cover on the other side.  Believe it will have a cast in date code, dots with a year, like '65'.

[Brian Conway]

First thanks for the help.  Took a look at the shifter plate and found the very small round casting you suggested I look for.  A number 2 over 4 dots over a number 65 all in the circle and rearward of the ' T-10 ' casting.  Brian

[CharlesTurner]

Looks like it could be the original, if the date code means April '65.

[Brian Conway]

It appears to be the original and that's nice.  The meaning of the number 2 is unknown and the aluminum shift plate is unexpected ?  It still pops out of 2nd when decelerating but nothing new there.  Thanks,  Brian 

[midlife]

First thanks for the help.  Took a look at the shifter plate and found the very small round casting you suggested I look for.  A number 2 over 4 dots over a number 65 all in the circle and rearward of the ' T-10 ' casting.  Brian

Holy Crap!  My 65 GT that I had from 1968-1977 was RDM 470! 

[Brian Conway]

     This car and plate have always been in San Diego.  The plate frame shows the dealership which is about 4 blocks from where me and the car live now.  Dealership is long gone but was once a big player in San Diego.  So where was your plate issued ?  Brian

[jwc66k]

Conventional wisdom and other sources, maintain that top loaders were used in all production Mustangs for 64 and 65, with T-10 transmissions also used in 1966 because of the high demand for 4 speeds. The exception is Shelby.

My much later (9/65) San Jose car had a T-10 in it. 

Your car is a 66 so a T-10 would be a viable substitution. I had a T-10 in a March 66 San Jose Fastback.

The car has had a T-10 in it, to my knowledge, since at least 1968. 

That leaves 65 thru 67 to have a replacement installed.

It still pops out of 2nd when decelerating but nothing new there. 

The close ratio T-10 in my 64 Fairlane 289HP popped out of second too. I think it was a "feature" (or an operator problem).
Jim

[midlife]

     This car and plate have always been in San Diego.  The plate frame shows the dealership which is about 4 blocks from where me and the car live now.  Dealership is long gone but was once a big player in San Diego.  So where was your plate issued ?  Brian

I bought my 65 GT Coupe second hand in 1968, so I do not know where it was sold.  And yes, it was also from the San Diego area (El Cajon).  Pearson Ford was where I usually took it for service back then.

[Brian Conway]

El Cajon is still there can't say the same for Pearson Ford.