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Rear differential decoded please

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Old Apr 7, 2015 | 02:53 PM
  #1  
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marshal135
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Default Rear differential decoded please

hello forum,
I climbed under the rear and this is what I found.
1AT6768W.
Pumpkin stamped 5 15 8.
Build date of car was June 14th 1968.
Drive train 427/390
Trans m20.
Thank you in advance.
Marshal
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Old Apr 7, 2015 | 03:17 PM
  #2  
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using this website as reference:

not sure what the 1 means. 1st shift on the production line, maybe?
AT = 3.08 Heavy Duty Positraction (427)
6768 = June 7, 1968
W = Warren plant where it was manufactured.
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Old Apr 7, 2015 | 05:39 PM
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Hi,
I think KT is right about the first digit indicating the shift that produced the unit.
Regards,
Alan
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Old Apr 8, 2015 | 11:36 AM
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marshal135
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KT & Alan,
Thank you for responding.
I learned allot about my differential code.
Amazing how much info is contained in a series of numbers
and letters
Marshal
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