Topic: Correct 4 Speed ?

[Brant]

Brain,

Also take a look at the machined area at the rear of the main case behind the side cover for an assembly date stamping.





The above example is from a '66 GT350. This particular date is decoded as C=March  1=1st day (of March)  6=1966  2=?...maybe shift # or inspector #?

[Brian Conway]

Thank you Brant.  Took a look and sure enough the case does have a stamp in that spot.  Very clearly;  C  2451.  No Idea what it means.  Brian

[midlife]

Thank you Brant.  Took a look and sure enough the case does have a stamp in that spot.  Very clearly;  C  2451.  No Idea what it means.  Brian

Based upon what Brant indicated, that looks to be March 24, 1965, shift 1?

[Brian Conway]

Well thanks for taking a look at that stamp and the date reading.  Certainly a dating format that I am not familiar with.  So far it's been an education.  Brian   

[steve_f]

Brian,
My May 15 San Jose GT has a T-10 in it as well.
Steve

[Brant]

Based upon what Brant indicated, that looks to be March 24, 1965, shift 1?

I agree March 24, 1965.

[Brian Conway]

Thanks Brant for the dating confirmation.  It seems I have two dates for my T-10.  Assembly date March 24,1965 and the shifter plate casting date April 1965.  I didn't know either of those dates were there until you guys told me where to look.  Thanks.  Steve has a T-10 in his May 15,1965 car and that does add some interest to my question ?  Thanks for posting that info.  Jim has a T-10 in his September,1966 car.  These are all San Jose cars so, it would seem, these transmissions were certainly around.   Add a few more cars to the list and we may be onto something ?  Thanks,  Brian

[WT8095]

Here's what the '75 MPC shows for applications. I did not include the 6-cyl applications on the preceeding page.

F/4/S = Ford
W/4/S = Warner

The star symbol indicates not serviced as a unit (by parts only).

[196667Bob]

Since there are apparently some T-10 "gurus" out there, maybe someone can help me. I have heard, and/ or read, that only the earlier bell housings will accept the T-10 transmission. In addition, I have also heard that the bell housing that will accept the T-10 will only bolt up to an early 289 block. Is this correct info ? If so, how can I tell (without taking out the existing transmission of course) if my November (1965) 1966 Mustang has this bell housing ? If I do not have the correct bell housing, do I have any options for being able to "bolt on" a T-10 to my existing 289 ?

Thanks for the help,

Bob

[JKWilson]

Since there are apparently some T-10 "gurus" out there, maybe someone can help me. I have heard, and/ or read, that only the earlier bell housings will accept the T-10 transmission. In addition, I have also heard that the bell housing that will accept the T-10 will only bolt up to an early 289 block. Is this correct info ? If so, how can I tell (without taking out the existing transmission of course) if my November (1965) 1966 Mustang has this bell housing ? If I do not have the correct bell housing, do I have any options for being able to "bolt on" a T-10 to my existing 289 ?

Thanks for the help,

Bob

I am by no means a T-10 "guru", but I can confirm a few things for you. The T-10 will bolt up to the 6-bolt 289 bell housing. Just like the early Toploader, early T-10's had a narrow bolt pattern transmission case which matched the early 5-bolt 260/289 bell housings, C3AA-6394-C. The late '65-On T-10's had a wider bolt pattern transmission case, as did the late Toploaders. My '66 fastback  (Metuchen plant, Oct. '65 sched. date), came equipped with a T-10 and is the 6-bolt bell housing, C5DA-6394-A.

[196667Bob]

Thanks for the info; however, I'm a little confused. When you say "The T-10 will bolt up to a 6 bolt bell housing", are you referring to Brian's T-10 ? I'm not sure what to think of mine. The cover has " 1 3 62" stamped on it (which I assume is January 3, 1962), yet the case, to the right (rear) of the cover, is stamped " M271-2", which using Brant's example would be "December 2, 1967. shift or inspection # 2". I had always thought that mine was the earlier T- 10 (it did not come with my November built Metuchen 1966 Coupe - I bought it for a Y-block back in the late 60's as it bolts right up to a Y-block bell housing). The top two bolt holes on the case are about 5-1/8" inches apart, the bottom two are about 6-3/8" apart, and the vertical spacing is about 7-1/4". Is this "early or late ? Do I need the C3 or C5 bell housing ? Finally, how can I tell which mine is - can I see the casting number from the engine compartment ? from under the car ? Is there a "giveaway" as th whether it is 5 bolt or 6 bolt by just looking at it from the top of the engine compartment ?

Thanks again for the help.

Bob

[JKWilson]

Sorry for any confusion. I was referring to your T-10 (hence my quoting your post). If your T-10 bolts to a Y-block bellhousing, it's probably an "early" transmission. The bolt pattern for it should be in a vertical rectangular shape. The "later" T-10's had a more horizontal rectangular pattern. One disclaimer though, T-10's also came with dual pattern cases meaning there are 8 holes which will bolt up to either pattern bellhousing.


You can find the bellhousing number cast onto the exterior passenger side "dome" where the starter is located.

Here's a couple of reference pics from the Mustang Tek website which illustrates the difference in bolt patterns:

Early 5 bolt bellhousing (notice the bolt pattern for the transmission.Also the location of the casting number)-

http://mustangtek.com/Bellhousings/C3AA-6394-C.html

6 bolt bellhousing (again compare the transmission bolt pattern. )-

http://mustangtek.com/Bellhousings/C5DA-6394-A.html

[196667Bob]

JK : Yes, that helps a lot. Mine is definitely the "vertical" rectangle pattern and not the "horizontal. And it only has the 4 holes. Now the question is, will the 6 bolt, C% bell housing bolt up to my November 1966 289 block ? In the meantime, I am going to see if I can locate the casting number on my '66 bell housing (the car is in a precarious postion, my garage, but I'll give it a try.

Thanks again for the help,

Bob

[Brian Conway]

Like to re-visit this discussion concerning the HEH-V, T-10 in my Late May 1965 San Jose car.  I will be pulling the trans for a rebuilt next week.  This would be an opportunity to fully inspect the case and contents for any other clues concerning assembly line installed or not.  Does the shifter assembly or rods hold any details that I could document ?  Suggestions on what to look for and where to look will be helpful.   Any advice will be appreciated..  Thanks,  Brian

[Brian Conway]

Got the trans out and can see much better what's there.  The shifter plate date clearly is 4 dots and 65.  A picture of the assembly date stamp.  Something new is a stamped C  A  A.  Located on the upper left mounting extension.  Looked very closely and there doesn't seem to be any other letters or numbers ?  Another clue may be the 1/2" thick aluminum spacer plate between the case and tailshaft ?  Anyone familiar with this C  A  A stamping method or code ?  Thanks, Brian