Cadillac 60 Series 1963 Shop Manual page 5

1-2
GENERAL INFORMATION
Engine Serial and Engine Unit Numbers
a. Engine Serial Number
Each Cadillac automobile or chassis carries
an engine serial number. The engine serial num-
ber is used in license and insurance applications
and in general reference to the automobile. The
first two digits of the number indicate the model
year. The letter following indicates the body
style, and the last six digits indicate the sequence
in which the car was built (see Page 1-1). The
last six digits of the first 1963 model automobile
manufactured will be number 000001, regardless
of series or style, and subsequent cars built will
be numbered in numerical order.
Body Styles
6039, 6229, 6257, 6267, 6239, 6329
6339, 6357, 6367, 6389
6039, 6229, 6257, 6267, 6239, 6329
6339, 6357, 6367, 6389
With Air Conditioning
6723, 6733, 6890
6723, 6733, 6890
With Air Conditioning
Engine
Unit No.
Prefix
36X
36K
37X
37 K
b. Engine Unit Number
Each Cadillac engine carries an engine unit
number prefix that indicates the type of engine,
followed by numbers in numerical sequence, de-
noting the order in which the engine was built,
regardless of type, starting with one. The letters
L.C. are added immediately following the engine
unit number on all engines built to low compres-
sion specifications. Production engines using .010
inch oversized pistons may be identified by an
asterisk stamped on the block following the engine
unit number.
Rear Axle Gear Ratio and
Serial Number Locations
The differential carrier serial number is
stamped on the bottom of the rear carrier flange.
The gear ratio code number appears on the front
face of the carrier assembly at the end of the oil
return passage. Rear axle gear ratio applications
are listed in Section 7, Note 1. The letter G pre-
ceding this numeral code designates a controlled
differential. (Example: Gl, meaning 3.21:1 Con-
trolled Differential).