Cast iron T-10 Transmissions in '66 G.T.350's

[acman63]

From my experience they pretty much phased out the aluminum T10s right around the time that they went to under ride traction bars.  Ive seen aluminum in cars on the 1000s serial wise  and Ive seen all cast iron as low as in the 1200s. Ive never seen any factory minutes or paperwork showing they mixed and matched alloy with cast iron in the production cars but Ive seen ads for the transmissions that way .  the tailshafts were very fragile and they broke easily

6S1078 has an all aluminum T10 maybe this was at the switch over point.

you are probably pretty accurate on that statement

[greekz]

6S1134 has a aluminum case and cast iron tail.  Have not checked the date code in a while.

Greek

[Sfm6sxxx]

There was a thread a while back where there were quite a few responses for cars near Greekz's and mine (1114) that had aluminum cases and cast iron tailshafts.

[s2ms]

Curiosity got the better of me so I had to have a look.  6S1575 is mid March Ford production date, T-10 main housing date is C 162 or March 1, 66 and tail housing is K 15 65 or November 15, 65.  Both cast iron.

6S1757 original tail housing is dated K 23 65, think the "K" is actually October since I assume there would have been no "I" dated month? Looks like there may have been a batch of these all cast iron close ratio T-10's assembled on 3/1/66.

[rraceme]

Great information. I have an additional question.  I think 67 GT350 had VIN number stamped on housing what about 1966 GT-350's? Was the VIN stamped on trannys?  thank you

[Tomdeg]

Question for Brant, s2ms, and jk66gt350, since all of yours were assembled on March 1, are the casting dates on the case and tailshaft the same too?

[Rocket]

6S550 has aluminum case and tail shaft housing. Ron

[jk66gt350]

Tomdeg - Further to my post earlier in this thread dated July 2019, for 6S1575 the T-10 main housing date is C 162 or March 1, 66 and tail housing is K 15 65 or November 15, 65.  Both cast iron.  John

[Tomdeg]

Hi John,
Thanks for the reply, but I was asking if the CASTING date of the main cases were all the same. I understand the ASSEMBLY date for all is C 162.

[jk66gt350]

Sorry for the misunderstanding.  I'm out of town for a few days and won't have a chance to have a look for the casting date until some time later next week.  I'll let you know when I get to it.

[s2ms]

Question for Brant, s2ms, and jk66gt350, since all of yours were assembled on March 1, are the casting dates on the case and tailshaft the same too?

Checked my notes and I could not find a casting date on the main case, only the tail housing. Next time I'm under the car I'll check and report if I find anything...

Dave

[pmustang]

2170 was Iron

[Tomdeg]

2170 was Iron

Is yours dated March 1st also?

[jk66gt350]

Just looked at the letters / numbers on my main case and tail housing.  I assume the casting date on the main case is just to the right of the W-1, which is under WO  DIV.  It's small and very hard to make out but it appears to be *  6 1  *

[papa scoops]

1122 has iron case and tailshaft. orig to car (except hurst shifter) car was feb 66 at ford, and shelby.