T10 casting dates missing OK?

[Ian G.]

When buying a T10 if someone offers a main case that has no casting date, is this legitimate? This would be on a T10-1. Do we know of T10s manufactured with no casting date, perhaps over the counter? I'm looking for an original T10 for my early 59 (Dec 58). Seems to me there would be no difference practically, between a wrong date and a missing date when you try to sell it. I'm finding main cases are hard to come by -- probably because that's the part that broke originally, leaving behind the tail, cover, separator plate, etc.

I know the T10 dates aren't judged for NCRS, but I'm trying to make the car matching numbers without fudging things wherever possible.

thanks for any insight!

[Timothy B.]

Re: T10 casting dates missing OK?

I don't know about 59 t-10's but for my 63 the main case I ended up buying is correctly dated with no year date cast on the passenger side of the main case.

The info I have read say's it's acceptable for T-10-D case in 63.. I have others with year cast so I don't know if it's a service piece or not.

[Philip C.]

Re: T10 casting dates missing OK?

When buying a T10 if someone offers a main case that has no casting date, is this legitimate? This would be on a T10-1. Do we know of T10s manufactured with no casting date, perhaps over the counter? I'm looking for an original T10 for my early 59 (Dec 58). Seems to me there would be no difference practically, between a wrong date and a missing date when you try to sell it. I'm finding main cases are hard to come by -- probably because that's the part that broke originally, leaving behind the tail, cover, separator plate, etc.

I know the T10 dates aren't judged for NCRS, but I'm trying to make the car matching numbers without fudging things wherever possible.

thanks for any insight!

Hi Ian T10-1 main cases have month and day dates only cast into the case and are found below the T10-1 casting numbers on the pass side of the case. The assy date stamped into the case by side cover sometimes have the year stamped with the assy date ex. WE 19 7-2 =Warner May 19,1957 2nd shift. I have seen assy dates with and without the year ex. WE 19 -1. The 57, 58 and early 59 cases I found have a round boss around the fill plug, later ones have an oval boss. Ian the above info is from my own experience, hope it helps you Phil 8063

[Tom P.]

Re: T10 casting dates missing OK?

Ian,
A customer just brought two T-10s over yesterday for me to rebuild.
Both main cases have mo-day only, but the tail HOUSINGS have 1960 year dates on them. I suspect both are virgin trannys, thus, I believe both are 1960 trannys. This is further confirmed by the oval boss for the filler plug. As mentioned , all the early (57-58) main cases that I've seen have round bosses for the filler plug.

[Ian G.]

Re: T10 casting dates missing OK?

So is it safe to say that a T10 main case without a date cast into it (even if just day and month) probably had it gorund off and isn't original in that respect? I'm talking about the casting date being missing, vs the stamped assembly date...

good info on the boss...

[Tom P.]

Re: T10 casting dates missing OK?

Most of the T10 main cases that I've ever seen only had mo-day, no year cast. And, if any numbers/letters had been ground off, there would be obvious grinding marks.

[Ian G.]

Re: T10 casting dates missing OK?

could someone post a pic of what the stamp on a T10-1 main case should look like?
The stamp that starts with a "W"...
From what I can tell, it seems like GM Winters foundry only stamped T10s on Fridays during the second shift.
Is that right? I did a little research on the web and looked for T10 dates and they are almost ALL on Friday and ending in "2" (second shift).

[Stewart A.]

Re: T10 casting dates missing OK?

Broach marks and all Ian.
BILD0700.jpg

[Ian G.]

Re: T10 casting dates missing OK?

thanks a lot Stewy!

[Stewart A.]

Re: T10 casting dates missing OK?

What I am amazed about on this tranny Ian is that sh...ty stamping. It looks like a 5 year old did it. If you look really hard next to the so called 2 you can faintly see another faded number that looks like the start of another 2. Any way I hope that helps. Stewy

[Ian G.]

Re: T10 casting dates missing OK?

Well, sonova... Your date is Nov 20th 59. Friday, second shift, Just like just about every other tranny number I have seen! Guess the guy couldn't wait to get started on the weekend Thanks again Stewy!

[Stewart A.]

Re: T10 casting dates missing OK?

Ian is L Dec or Nov do we miss a letter.

[Ian G.]

Re: T10 casting dates missing OK?

I believe on most stampings, you skip the "I", so M = December on date stamps, but on castings you do NOT skip the "I", so L = December on an engine/head casting. Please correct me if I am wrong...

[Timothy B.]

Re: T10 casting dates missing OK?

Here are pics of a T-10 D-1 main body cast without the year date (62) next to the month and day.

The stamping on the other side has the correct date, I think it's WK2522, (October 25,1962)

[John H.]

Re: T10 casting dates missing OK?

From what I can tell, it seems like GM Winters foundry only stamped T10s on Fridays during the second shift.

Ian -

Neither GM nor the Winters Foundry had anything to do with the Borg-Warner transmission castings; B-W had their own foundry.