GENERAL INFORMATION OA-5
Figure 10—Rear Axle I.D. Location
EATON METRIC FASTENERS
All Eaton axles have an identification tag on the side
of the differential carrier (figure 10).
Differential Carrier Tag
The carrier tag contains the axle model, gear ratio,
carrier assembly number, carrier serial number, and
date of assembly. It is recommended when referring to
the axle that all information recorded on these tags be
obtained to aid in identifying the axle assembly.
Axle Housing Tag
The housing tag is the same type of tag used for the
carrier, but with separate serial and assembly I.D.num
bers and no ratio identification.
TRANSMISSION
IDENTIFICATION NUMBER
ALLISON
Allison transmission identification plate is located on
the housing rear left side, just above the oil pan (figure
11).
Current model GM vehicles are primarily dimensioned
in the metric system. Many fasteners are metric and are
very close in dimension to well-known customary fas
teners in the inch system. It is most important that
replacement fasteners be of the correct nominal diame
ter, thread pitch, and strength.
Original equipment metric fasteners (except “beauty”
bolts, such as exposed bumper bolts and cross recess
head screws) are identified by a number marking indi
cating the strength of the material in the fastener as
outlined later. Metric cross recess screws are identified
by a Posidriv or Type ,1A. Either a Phillips head or Type
1A cross recess screwdriver can be used in Posidriv
recess screw heads, but Type 1A cross recess screw
drivers will perform better.
Important
• Most metric fasteners have a blue color coating.
However, this should not be used as positive
identification, as some fasteners are not color
coated.
EATON-FULLER
Eaton-Fuller transmission identification plates are
located on the right rear side of the housing, near the
top cover (figures 12 and 13).
MODEL IDENTIFICATION
Models and body styles are listed in figures 14 and
15. ’ ' . 7 " ' - ■
General Motors Engineering Standards, along with
other North American Industries, have adopted a por
tion of the Standard metric fastener sizes defined by
ISO (International Standards Organization). This was
'done to reduce the number of fastener sizes used and
yet .retain the best strength qualities in each thread
size. For example, the customary 1/4-20 and 1/4-28
screws are replaced by the metric M6.0X1 screw which
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