No, I am looking for the expansion of the letter codes in positions 2-4. For example, the ATSG 4L60E Technical Manual identifies "3KAD" as a 2003 transmission behind 4.3L V-6 in a K truck; "3CJD" as a 2003 transmission behind a 5.7L V-8 in a C truck or G van. ... Login to read more.