Spicer Revised Serial Tags used in the Identification of Spicer Axle Assemblies - Manual (Page 2)

Serial Numbers
Carrier Assembly Serial Numbers
Starting in May of 1987, Spicer began assigning serial numbers to carrier assemblies in addition to a date code.
The “Serialized Julian” serial numbers are stamped into the carrier casting or on a metal tag affixed to the
carrier.
The carrier assembly serial number consists of ten characters; a letter followed by nine numerals.
The letter designation indicates the producing plant; either an “H” for Henderson, Kentucky plant, or “G” for
Glasgow, Kentucky plant. A five digit Julian date code follows, the first two digits indicates the year, and the last
three indicates the day of the year. The last four digits are a number unique to each axle.
Older Model Serial Numbers
Units built before February 1982 used a 4 digit date code which was stamped into the carrier casting.
The first 3 digits representing the day of the year, and the last digit represents the year
(Exm H2328 232nd day of 1978). After February 1982 they went to a 5 digit date code, same format,
but added 2 digits for the year. In May 1987 Spicer went to a serialized julian date code system that
represents the unique serial number. The serial number as explained above is stamped into the carrier
or onto a metal tag attached to the carrier.
Axle Housing Serial Numbers
Axle Housings are identified with tags that also have serial numbers. All axle housing serial numbers are
internal to the manufacturing plant and cannot be used identifying any other Spicer component, refer to
the carrier assembly tag.
Drive Axle Specification Numbers
The axle specifications numbers are stamped onto a metal tag attached to the carrier assembly, see
page 3. On older axles produced without a metal tag, the specification number was stamped into the
right side arm of the axle housing. The specification number consisted of the letter “S” followed by a 5
digit number, followed again by a letter (A,B,C or D). As with the newer specification numbers this
stamped number will identify all components of the axles built by Spicer.
Producing Plant
Year produced
Day of year produced (1-365)
Unique number assigned to each axle produced.
H 9 6 1 7 9 6 7 3 3
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