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Hard to say if that is the trans number or not. I kind of think not because it doesn't look like it could easily be changed to fall in a sequential range with it being in the casting. If it's the part I think it is & is separate from the transmission case, probably not the SN but rather the casting number for that piece.

Do you have anything resembling this number faintly stamped on the trans. The one shown is off a 56 and is located just to left of tailshaft on the flange pan bolts to. No idea if regular Ultras were in same place though.

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HH56, can't quite make out that first character, might it be a "B"? If so that looks like a Utica Plant trans number for a 1956 Clipper Super and probably the same code was used on the Executives. If the first character isn't an alpha between A and D, then I don't know what that # represents. I've also seen letters like initials stamped on the Twin cases at the rear and wondered if they were the initials of the assembler.

Here's a photo of 56 Caribbean trans #1107. See the "initials?" and also a second set of numbers to the right of the Utica trans#. I have no idea what the second set of #s denotes. The Utica trans #s also started at 1001 so this is the 107th 56 Carib trans, but that doesn't mean it went in Carib VN 1107.

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It is a B 7032. Did come from a Clipper and there is a 5 point star ☆ to the left of it. I don't remember (or if I ever knew) what that star denotes unless it possibly means one of the late design separator plates was retrofitted.

Thanks for the clarification.

I have no idea what the star denotes. One of the TSBs did outline the transmission numbers for the different series at which certain changes were made, perhaps I should re-read it but I don't recall anything about markings on the trans itself.

I have a "B"-series 56 trans out in the garage, I'll try to see what numbers it might have on it tomorrow.

To: J.R.P.III The post by buckethttps://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?topic_id=8366&forum=8&post_id=90022#forumpost90022 shows a casting date on the transmission. In lieu of a serial number, I doubt they made that many cases so far in advance that a year would change--other than there may be a gray area in mid to late year around model changeover time. That date might be a way to at least get close to the one you are looking for--

I am going to get under Betty ( my 52 200 dlx ) and look for the numbers, take some pictures and post. thanks .
more later

The main case casting is the same part number, I believe, all way from 1949 (23rd series) thru 1954 until the gear-start.

on my 52

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that is all the stamped numbers i could find on my Ultramatic. rear of pan drivers side. i know the motor was replace with a 51 288. (before i owned it) let's hope the Tranny is original.

not a 52 , 12-15-53 so says the tag. my 52 200deluxe has a 51'288 and a 53 Ultra-matic

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