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healey View Drop Down
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    Posted: 31 Aug. 2010 at 10:26pm
Was looking over a couple spare trasnmissions today and noticed an odd date stamp on my 1948.  Picture below.  The main # reads A1581, but there is a number 15 stamped at an angle before this.  Any idea what it's for? 
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lowenuf View Drop Down
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Points: 9122 		Post Options Post Options   Thanks (0) Thanks(0)   Quote lowenuf Quote  Post ReplyReply Direct Link To This Post Posted: 31 Aug. 2010 at 11:54pm
no idea on the "15", i have seen extra letters in that fashion before....but on later model trannys..
 
also, your tranny's date decodes to January 15, 1981........
45 #10012
45 #10033 ACM #47
45 #10163 ACM #188
57 CJ5    Dauntless V6, T-18 4-speed, D-44 rear/D-30 front, D-20 twin stick
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healey View Drop Down
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Points: 288 		Post Options Post Options   Thanks (0) Thanks(0)   Quote healey Quote  Post ReplyReply Direct Link To This Post Posted: 31 Aug. 2010 at 11:59pm
1981?  How can that be?
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sean View Drop Down
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I think Willys (or Warner) changed the meaning of the stamping sometime.  Don't know how to interpret it yet.

This was on my late Dec. '47, #148295:


"K" still makes sense as a production month (Nov.) (now believe this is Oct.), "30" still makes sense as a day, but the last 2 digits are NOT the year.

Sean


Edited by sean - 08 Sep. 2010 at 6:46pm
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2A #16279
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first shift / second shift date coding maybe
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I was thinking along the same lines as munkjeep. Also the 8 would coinside with "48" and the 7 with Sean's 47.
Rob H.

1948 CJ2A
bits and pieces of three 3A's
1967-72 Chevy C/10 kinda combined them LOL




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sean View Drop Down
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Points: 7388 		Post Options Post Options   Thanks (0) Thanks(0)   Quote sean Quote  Post ReplyReply Direct Link To This Post Posted: 08 Sep. 2010 at 6:35pm
Rob:
Quote I was thinking along the same lines as munkjeep. Also the 8 would coinside with "48" and the 7 with Sean's 47.
I think you nailed it!

Looking at the owner reported date stampings, it seems they dropped "4" out of the year stamp.  Still don't know what the last digit might indicate though.  Some have it, some don't.  But munkjeeps suggestion makes sense too!  3 x 8-hour shifts.

Up until about mid-46, date stampings show a 2-digit year.  eg:
  • H 28 45
  • M 31 45
  • A 26 46
  • D 22 46
Then beginning about August, no more "4", and later dates have the following final digit (1, 2 or 3):
  • H 22 6
  • K 14 6
  • A 24 7
  • D 27 8 (1)
  • F 4 7 (2)
  • B 11 8 (3)
  • ... and so on
It also seems they skipped the letter "I", probably to avoid confusion with numeral "1" (as Autolite did too).

Sean




Edited by sean - 08 Sep. 2010 at 6:47pm
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all4jpn View Drop Down
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mine.....since its a t90...nov 24 1954 right?
46 cj/06 lj/ and mb/2a/38 hybrid project
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sean View Drop Down
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Points: 7388 		Post Options Post Options   Thanks (0) Thanks(0)   Quote sean Quote  Post ReplyReply Direct Link To This Post Posted: 09 Sep. 2010 at 2:34pm
Originally posted by all4jpn all4jpn wrote:

...since its a t90...nov 24 1954 right?
Could be.  What's the casting date?  That usually includes the year.

Sean
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all4jpn View Drop Down
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Points: 1778 		Post Options Post Options   Thanks (0) Thanks(0)   Quote all4jpn Quote  Post ReplyReply Direct Link To This Post Posted: 09 Sep. 2010 at 3:39pm
wheres that at? :)
46 cj/06 lj/ and mb/2a/38 hybrid project
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sean View Drop Down
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On the drivers side of the casting:


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all4jpn View Drop Down
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Points: 1778 		Post Options Post Options   Thanks (0) Thanks(0)   Quote all4jpn Quote  Post ReplyReply Direct Link To This Post Posted: 09 Sep. 2010 at 5:24pm
mine says 10-29...thats it...
46 cj/06 lj/ and mb/2a/38 hybrid project
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sean View Drop Down
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Points: 7388 		Post Options Post Options   Thanks (0) Thanks(0)   Quote sean Quote  Post ReplyReply Direct Link To This Post Posted: 10 Sep. 2010 at 1:59pm
Hmmm, they must have stopped putting the year in the casting?  Haven't seen one without the year.

Edited by sean - 10 Sep. 2010 at 2:00pm
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Csagers View Drop Down
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just to ad a little info to this 9yr old thread... i just found a 10 stamped on the top of the top right ear of my side shift, where it would bolt to the bellhousing.   I dont remember hearing about this marking before. 
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