|
YEAR |
RATIO |
OPEN |
POSI |
MODEL |
NOTES: |
|
1964 |
3.08 |
D |
D |
GTO |
REG BRAKES |
|
1964 |
3.23 |
K |
K |
GTO |
REG BRAKES |
|
1964 |
3.23 |
L |
L |
GTO |
HD METALLIC BRAKES |
|
1964 |
3.36 |
E |
E |
GTO |
REG BRAKES |
|
1964 |
3.36 |
M |
M |
GTO |
HD METALLIC BRAKES |
|
1964 |
3.55 |
F |
F |
GTO |
REG BRAKES |
|
1964 |
3.55 |
N |
N |
GTO |
HD METALLIC BRAKES |
|
1964 |
3.90 |
H |
H |
GTO |
REG BRAKES |
|
1964 |
3.90 |
NONE |
P |
GTO |
HD METALLIC BRAKES |
|
1965 |
3.08 |
WE |
YE |
GTO |
REG BRAKES |
|
1965 |
3.08 |
XE |
ZE |
GTO |
METALLIC BRAKES |
|
1965 |
3.23 |
WF |
YF |
GTO |
REG BRAKES |
|
1965 |
3.23 |
XF |
ZF |
GTO |
METALLIC BRAKES |
|
1965 |
3.36 |
WG |
WG |
GTO |
REG BRAKES |
|
1965 |
3.36 |
XG |
ZG |
GTO |
METALLIC BRAKES |
|
1965 |
3.55 |
WH |
YH |
GTO |
REG BRAKES |
|
1965 |
3.55 |
XH |
ZH |
GTO |
METALLIC BRAKES |
|
1965 |
3.90 |
NONE |
ZK |
GTO |
METALLIC BRAKES |
|
1965 |
4.33 |
NONE |
ZL |
GTO |
METALLIC BRAKES |
|
1966 |
3.08 |
WE |
YE |
GTO |
REG BRAKES |
|
1966 |
3.08 |
XE |
ZE |
GTO |
METALLIC BRAKES |
|
1966 |
3.23 |
WF |
YF |
GTO |
REG BRAKES |
|
1966 |
3.23 |
XF |
ZF |
GTO |
METALLIC BRAKES |
|
1966 |
3.36 |
WG |
YG |
GTO |
REG BRAKES |
|
1966 |
3.36 |
XG |
ZG |
GTO |
METALLIC BRAKES |
|
1966 |
3.55 |
WH |
YH |
GTO |
REG BRAKES |
|
1966 |
3.55 |
XH |
ZH |
GTO |
METALLIC BRAKES |
|
1966 |
3.90 |
NONE |
ZK |
GTO |
METALLIC BRAKES |
|
1966 |
4.33 |
NONE |
ZL |
GTO |
METALLIC BRAKES |
|
1967 |
2.56 |
WB |
YB |
FB |
|
|
1967 |
2.56 |
WB |
YB |
GTO |
AUTOMATIC ONLY |
|
1967 |
2.78 |
WC |
YC |
FB |
|
|
1967 |
2.78 |
WC |
YC |
GTO |
AUTOMATIC ONLY |
|
1967 |
2.93 |
WD |
YD |
FB |
|
|
1967 |
2.93 |
WD |
YD |
GTO |
AUTOMATIC ONLY |
|
1967 |
3.08 |
WE |
YE |
FB |
|
|
1967 |
3.08 |
WE |
YE |
GTO |
MANUAL ONLY |
|
1967 |
3.23 |
WF |
YF |
FB |
|
|
1967 |
3.23 |
WF |
YF |
GTO |
AUTO/MANUAL |
|
1967 |
3.36 |
WG |
YG |
FB |
|
|
1967 |
3.36 |
WG |
YG |
GTO |
AUTOMATIC ONLY |
|
1967 |
3.55 |
WH |
YH |
FB |
|
|
1967 |
3.55 |
WH |
YH |
GTO |
AUTO/MANUAL |
|
1967 |
3.90 |
WK |
YK |
FB |
|
|
1967 |
3.90 |
WK |
YK |
GTO |
AUTO/MANUAL |
|
1967 |
4.33 |
NONE |
YL |
FB |
|
|
1967 |
4.33 |
WK |
YL |
GTO |
AUTO/MANUAL |
|
1968 |
2.56 |
XB |
ZB |
FB |
|
|
1968 |
2.56 |
WB |
YB |
GTO |
2 PINION 9792799 |
|
1968 |
2.78 |
XC |
ZC |
FB |
|
|
1968 |
2.78 |
WC |
YC |
GTO |
2 PINION |
|
1968 |
2.93 |
XD |
ZD |
FB |
|
|
1968 |
2.93 |
WD |
YD |
GTO |
2 PINION |
|
1968 |
3.08 |
XE |
ZE |
FB |
|
|
1968 |
3.08 |
WE |
YE |
GTO |
2 PINION |
|
1968 |
3.23 |
XF |
ZF |
FB |
|
|
1968 |
3.23 |
WF |
YF |
GTO |
2 PINION |
|
1968 |
3.36 |
XG |
ZM |
FB |
HD 4 PINION |
|
1968 |
3.36 |
WG |
NONE |
GTO |
2 PINION |
|
1968 |
3.36 |
NONE |
ZG |
GTO |
4 PINION |
|
1968 |
3.55 |
XH |
ZN |
FB |
HD 4 PINION |
|
1968 |
3.55 |
WH |
NONE |
GTO |
2 PINION |
|
1968 |
3.55 |
NONE |
ZH |
GTO |
4 PINION 9793020 |
|
1968 |
3.90 |
NONE |
ZP |
FB |
HD 4 PINION |
|
1968 |
3.90 |
NONE |
ZK |
GTO |
4 PINION |
|
1968 |
4.33 |
NONE |
ZR |
FB |
HD 4 PINION |
|
1968 |
4.33 |
NONE |
ZL |
GTO |
4 PINION 9793235 |
|
1969 |
2.56 |
YB |
ZB |
FB |
|
|
1969 |
2.56 |
WB |
XB |
GTO |
AUTOMATIC ONLY |
|
1969 |
2.78 |
YC |
ZC |
FB |
|
|
1969 |
2.78 |
WC |
XC |
GTO |
AUTOMATIC ONLY |
|
1969 |
2.93 |
YD |
ZD |
FB |
|
|
1969 |
2.93 |
WD |
XD |
GTO |
AUTOMATIC ONLY |
|
1969 |
3.08 |
YE |
ZE |
FB |
|
|
1969 |
3.08 |
WE |
XE |
GTO |
AUTO/MANUAL |
|
1969 |
3.23 |
YF |
ZF |
FB |
|
|
1969 |
3.23 |
WF |
XF |
GTO |
AUTO/MANUAL |
|
1969 |
3.36 |
YG |
ZG |
FB |
|
|
1969 |
3.36 |
WG |
XG |
GTO |
AUTO/MANUAL |
|
1969 |
3.55 |
YH |
ZH |
FB |
|
|
1969 |
3.55 |
WH |
XH |
GTO |
AUTO/MANUAL 9795084 |
|
1969 |
3.90 |
NONE |
ZK |
FB |
HD 4 PINION |
|
1969 |
3.90 |
NONE |
XK |
GTO |
AUTO/MANUAL 9795084 |
|
1969 |
4.33 |
NONE |
ZM |
FB |
HD 4 PINION |
|
1969 |
4.33 |
NONE |
XM |
GTO |
AUTO/MANUAL 9795084 |
|
1970 |
2.73 |
CRX |
CRY |
FB |
|
|
1970 |
3.07 |
|
COT |
FB |
|
|
1970 |
3.07 |
WT |
XT |
GTO |
AUTOMATIC ONLY |
|
1970 |
3.08 |
COE |
COF |
FB |
|
|
1970 |
3.08 |
WE |
XE |
GTO |
MANUAL ONLY |
|
1970 |
3.23 |
WF |
XF |
GTO |
AUTO/MANUAL |
|
1970 |
3.31 |
COU |
COV |
FB |
|
|
1970 |
3.31 |
WU |
XU |
GTO |
455 HO ONLY(C-TYPE AXLE) 12 BOLT |
|
1970 |
3.36 |
COK |
|
FB |
|
|
1970 |
3.55 |
COW |
COX |
FB |
|
|
1970 |
3.55 |
WV |
XV |
GTO |
455 HO ONLY(C-TYPE AXLE) 12 BOLT |
|
1970 |
3.55 |
WH |
XH |
GTO |
AUTO/MANUAL |
|
1970 |
3.73 |
NONE |
COZ |
FB |
|
|
1970 |
3.90 |
NONE |
XK |
GTO |
AUTO/MANUAL 9799202 |
|
1970 |
3.90 |
WK |
YK |
GTO |
ONLY WITH M-21 TRANS 9799202 |
|
1970 |
4.33 |
NONE |
XM |
GTO |
AUTO/MANUAL 9799202 |
|
1970 |
4.33 |
NONE |
7N |
GTO |
AUTO/MANUAL 9799202 |
|
1971 |
2.56 |
WB |
XB |
GTO |
|
|
1971 |
2.73 |
GZG |
CAG |
FB |
|
|
1971 |
2.78 |
WC |
XC |
GTO |
|
|
1971 |
3.07 |
WT |
XT |
GTO |
|
|
1971 |
3.08 |
GXG |
GYG |
FB |
|
|
1971 |
3.08 |
WE |
XE |
GTO |
|
|
1971 |
3.23 |
WF |
XF |
GTO |
|
|
1971 |
3.31 |
WU |
XU |
GTO |
|
|
1971 |
3.42 |
CKG |
CJG |
FB |
|
|
1971 |
3.55 |
WH |
XH |
GTO |
|
|
1971 |
3.73 |
NONE |
CGG |
FB |
|
|
1971 |
3.90 |
WK |
XK |
GTO |
|
|
1971 |
4.33 |
NONE |
XM |
GTO |
|
|
1972 |
2.56 |
WB |
XB |
GTO |
|
|
1972 |
2.73 |
GZG |
CAG |
FB |
|
|
1972 |
2.78 |
WC |
XC |
GTO |
|
|
1972 |
3.07 |
WT |
XT |
GTO |
|
|
1972 |
3.08 |
GXG |
GYG |
FB |
|
|
1972 |
3.08 |
WE |
XE |
GTO |
|
|
1972 |
3.23 |
WF |
XF |
GTO |
9799100 |
|
1972 |
3.31 |
WU |
XU |
GTO |
|
|
1972 |
3.42 |
CKG |
CJG |
FB |
|
|
1972 |
3.55 |
WH |
XH |
GTO |
|
|
1972 |
3.73 |
NONE |
CGG |
FB |
|
|
1973 |
2.73 |
GZG |
CAG |
FB |
|
|
1973 |
3.08 |
GXG |
GYG |
FB |
|
|
1973 |
3.42 |
CLG |
CMG |
FB |
|
|
1974 |
2.73 |
GZG |
CAG |
FB |
|
|
1974 |
2.73 |
JA |
JM |
GTO |
|
|
1974 |
3.08 |
GXG |
GYG |
FB |
|
|
1974 |
3.08 |
JB |
JN |
GTO |
|
|
1974 |
3.42 |
CLG |
CMG |
FB |
|
|
1975 |
2.56 |
AH |
CH |
A |
ALL PLANTS |
|
1975 |
2.56 |
WK |
XK |
A |
|
|
1975 |
2.56 |
WF |
XF |
A WAGON |
|
|
1975 |
2.56 |
KF |
LF |
B |
|
|
1975 |
2.56 |
UF |
VF |
B |
|
|
1975 |
2.56 |
PG |
PT |
F |
|
|
1975 |
2.56 |
WK |
XK |
G |
|
|
1975 |
2.56 |
GA |
JU |
X |
|
|
1975 |
2.73 |
AC |
CC |
A |
ALL PLANTS |
|
1975 |
2.73 |
WL |
XL |
A |
|
|
1975 |
2.73 |
WA |
XS |
A WAGON |
|
|
1975 |
2.73 |
UA |
VA |
B |
|
|
1975 |
2.73 |
YA |
ZA |
B WAGON |
|
|
1975 |
2.73 |
PA |
PU |
F |
|
|
1975 |
2.73 |
WL |
XL |
G |
|
|
1975 |
2.73 |
GB |
JV |
X |
|
|
1975 |
2.93 |
AF |
CF |
A |
|
|
1975 |
2.93 |
WM |
XM |
A |
|
|
1975 |
2.93 |
WB |
XB |
A WAGON |
|
|
1975 |
2.93 |
UJ |
VJ |
B |
|
|
1975 |
2.93 |
UB |
VB |
B |
|
|
1975 |
2.93 |
YB |
ZB |
B WAGON |
|
|
1975 |
2.93 |
WM |
XM |
G |
|
|
1975 |
3.08 |
AD |
CD |
A |
|
|
1975 |
3.08 |
PC |
PW |
F |
|
|
1975 |
3.08 |
GD |
JX |
X |
|
|
1975 |
3.23 |
UD |
VD |
B |
|
|
1975 |
3.23 |
YD |
ZD |
B WAGON |
|
|
1976 |
2.41 |
PJG |
PSG |
FB |
|
|
1976 |
2.73 |
PAG |
PUG |
FB |
|
|
1976 |
3.08 |
PCG |
PWG |
FB |
|
|
1976 |
3.23 |
NONE |
LDG |
FB |
|
|
1977 |
2.41 |
PJG |
PSG |
FB |
|
|
1977 |
2.56 |
PHG |
PTG |
FB |
|
|
1977 |
3.08 |
PCG |
PWG |
FB |
|
|
1977 |
3.23 |
PDG |
PXG |
FB |
|
|
1978 |
2.41 |
2PJ |
2PS |
FB |
|
|
1978 |
2.56 |
2PH |
2PT |
FB |
|
|
1978 |
3.08 |
2PC |
2PW |
FB |
|
|
1978 |
3.23 |
2PD |
2PX |
FB |
|
|
1978 |
3.42 |
2PE |
2PY |
FB |
|
|
1979 |
2.41 |
2PJ |
2PS |
FB |
|
|
1979 |
2.56 |
2PH |
2PT |
FB |
|
|
1979 |
3.08 |
2PC |
2PW |
FB |
|
|
1979 |
3.23 |
2PD |
2PX |
FB |
|
|
1979 |
3.23 |
|
2PP |
FB |
|
|
1979 |
3.42 |
2PE |
2PY |
FB |
|
|
1979 |
3.42 |
|
2PO |
FB |
|
|
1980 |
2.41 |
2PJ |
2PS, 5PV |
FB |
|
|
1980 |
2.56 |
2PH |
2PT |
FB |
|
|
1980 |
3.08 |
2PC |
2PW |
FB |
|
|
1980 |
3.23 |
2PD |
2PX, 5PQ |
FB |
|
|
1980 |
3.42 |
2PE |
2PY, |
FB |
|
The axle code, which is a two-character code, is stamped on the front passenger side axle tube to the left of the carrier case. For example, axle code PX G70621 found on a 1977 Trans Am would be deciphered as; PX = Ring and Pinion Gear size 3.23(shown below), G = Manufacturer, Chevrolet Gear and Axle, 062 = Julian date which is the 62nd day of 1977 or March 1, 1977, 1= is the shift when built, in this case 1st shift.
1967
|
1968
|
1969 ZB - 2.56 Rear Gear (Posi) ZC - 2.78 Rear Gear (Posi) ZD - 2.93 Rear Gear (Posi) ZE - 3.08 Rear Gear (Posi) ZF - 3.23 Rear Gear (Posi) ZG - 3.36 Rear Gear (Posi) ZH - 3.55 Rear Gear (Posi) ZK - 3.90 Rear Gear (Posi) ZM - 4.33 Rear Gear (Posi) YB - 2.56 Rear Gear (Open) YC - 2.78 Rear Gear (Open) YD - 2.93 Rear Gear (Open) YE - 3.08 Rear Gear (Open) YF - 3.23 Rear Gear (Open) YG - 3.36 Rear Gear (Open) YH - 3.55 Rear Gear (Open) |
1970
|
1971 CA - 2.73 Rear Gear (Posi) CB - 4.10 Rear Gear (Posi) CG - 3.73 Rear Gear (Posi) CJ - 3.42 Rear Gear (Posi) GY - 3.08 Rear Gear (Posi) CK - 3.42 Rear Gear (Open) GX - 3.08 Rear Gear (Open) GZ - 2.73 Rear Gear (Open) |
1972 CA - 2.73 Rear Gear (Posi) CG - 3.73 Rear Gear (Posi) CJ - 3.42 Rear Gear (Posi) CM - 3.42 Rear Gear (Posi) GY - 3.08 Rear Gear (Posi) CK - 3.42 Rear Gear (Open) CL - 3.42 Rear Gear (Open) GX - 3.08 Rear Gear (Open) GZ - 2.73 Rear Gear (Open) |
1973
|
1974 CA - 2.73 Rear Gear (Posi) CM - 3.42 Rear Gear (Posi) GY - 3.08 Rear Gear (Posi) CL - 3.42 Rear Gear (Open) GX - 3.08 Rear Gear (Open) GZ - 2.73 Rear Gear (Open) |
1975 PT - 2.56 Rear Gear (Posi) PU - 2.73 Rear Gear (Posi) PW - 3.08 Rear Gear (Posi) PA - 2.73 Rear Gear (Open) PC - 3.08 Rear Gear (Open) PG - 2.56 Rear Gear (Open) |
| 1976 PS - 2.41 Rear Gear (Posi) PU - 2.73 Rear Gear (Posi) PW - 3.08 Rear Gear (Posi) PX - 3.23 Rear Gear (Posi) LD - 3.23 Rear Gear (Posi) PA - 2.73 Rear Gear (Open) PC - 3.08 Rear Gear (Open) PJ - 2.41 Rear Gear (Open) PD - 3.23 Rear Gear (Open) |
1977 PS - 2.41 Rear Gear (Posi) PT - 2.56 Rear Gear (Posi) PW - 3.08 Rear Gear (Posi) PX - 3.23 Rear Gear (Posi) PJ - 2.41 Rear Gear (Open) PC - 3.08 Rear Gear (Open) PH - 2.56 Rear Gear (Open) PD - 3.23 Rear Gear (Open) |
1978
|
| 1979 PS - 2.41 Rear Gear (Posi) PV - 2.41 Rear Gear (Posi) PT - 2.56 Rear Gear (Posi) PU - 2.73 Rear Gear (Posi) PR - 2.73 Rear Gear (Posi) PW - 3.08 Rear Gear (Posi) PQ - 3.08 Rear Gear (Posi) PX - 3.23 Rear Gear (Posi) PP - 3.23 Rear Gear (Posi) PO - 3.42 Rear Gear (Posi) PJ - 2.41 Rear Gear (Open) PH - 2.56 Rear Gear (Open) PA - 2.73 Rear Gear (Open) PC - 3.08 Rear Gear (Open) PD - 3.23 Rear Gear (Open) |
1980 PS - 2.41 Rear Gear (Posi) PV - 2.41 Rear Gear (Posi) PT - 2.56 Rear Gear (Posi) PU - 2.73 Rear Gear (Posi) PO - 3.08 Rear Gear (Posi) PW - 3.08 Rear Gear (Posi) PQ - 3.08 Rear Gear (Posi) PX - 3.23 Rear Gear (Posi) PY - 3.42 Rear Gear (Posi) PO - 3.42 Rear Gear (Posi) PJ - 2.41 Rear Gear (Open) PH - 2.56 Rear Gear (Open) PA - 2.73 Rear Gear (Open) PD - 3.23 Rear Gear (Open) PB - 3.42 Rear Gear (Open) PC - 3.08 Rear Gear (Open) |
1981 PS - 2.41 Rear Gear (Posi) PV - 2.41 Rear Gear (Posi) PT - 2.56 Rear Gear (Posi) PU - 2.73 Rear Gear (Posi) PQ - 3.08 Rear Gear (Posi) PW - 3.08 Rear Gear (Posi) PY - 3.42 Rear Gear (Posi) PX - 3.23 Rear Gear (Posi) PJ - 2.41 Rear Gear (Open) PH - 2.56 Rear Gear (Open) PA - 2.73 Rear Gear (Open) PC - 3.08 Rear Gear (Open) PD - 3.23 Rear Gear (Open) PE - 3.42 Rear Gear (Open) |
I had alot of help from various web sources and from the Catalog of Firebird ID Numbers 1967-93, the Parts and Illustration Catalog from Pontiac, and various other sources.
GM PRODUCTS width------ years------------orig make..outside to outside 54.25 1983-2004 Chevy S10 2WD, GMC S15 2WD 57.75 1962-1964 Chevy II/Nova 57.75 1965-1967 Chevy II/Nova 58.00 1978-1988 Chevy Malibu, Monte Carlo 59.50 1968-1982 Corvette 60.00 1955-1964 Chevy Car 60.00 1967-1969 Camaro 60.25 1968-1979 Chevy II/Nova 60.50 1984-1995 Corvette 60.50 1964-1967 Chevelle 62.00 1955-1959 Chevy Pickup 62.50 1968-1972 Chevelle 62.50 1970-1981 Camaro/Firebird ford 56.50 1969-1977 Maverick 8" 57.00 1974-1978 Mustang II 8" 57.25 1957-1959 Ford, Ranchero, Station Wagon 57.25 1965-1966 Mustang 58.00 1966-1977 Bronco 58.00 1964-1965 Falcon 58.00 1977-1981 Granada/Versailles 58.50 1977-1981 Versailles 59.25 1967-1970 Mustang, Fairlane, Comet, Cougar 60.00 1967 Cougar 60.00 1958-1960 Edsel 61.00 1964-1971 Ford Full Size 61.00 1949-1951 Mercury 61.25 1957-1972 Ford F-100 Pickup 61.25 1960-1964 Ford Full Size 61.25 1971-1973 Mustang 61.25 1967-1973 Torino, Ranchero, Fairlane 63.00 1970-1979 Ranchero & Torino 63.00 1972-1979 Ford Full Size & Intermediate 63.50 1967 Fairlane (Coil Springs) 65.25 1973-1986 Ford F-150 Pickup 65.25 1978-1986 Bronco 65.25 1973-1986 Ford Van 3/4 Ton 68.00 1972 Ford Van 3/4 Ton 69.25 1977-1986 Ford E-150 Van mopar 55.60 1960-1976 7 1/4 A-body 55.60 1973-1976 8 1/4 A-body 55.60 1966-1972 8 3/4 A-body 55.60 All 8 3/4 A-body 56.00 1932-1934 All Mopars 57.40 1963-1972 7 1/4 A-body 58.54 All 8 1/4 F-body 58.54 All 8 1/4 M-body 58.54 All 8 1/4 J-body 59.00 1935-1936 All Mopars 59.14 1966-1970 9 3/4 B-body 59.20 1962-1970 8 3/4 B-body 60.00 1937-1948 All Mopars 60.70 All 8 3/4 E-body 60.70 All 9 3/4 E-body 62.00 All 8 1/4 B-body 62.00 1971-1974 8 3/4 B-body 62.00 All 9 1/4 B-body 63.40 All 8 1/4 C-body 63.40 1971-1974 8 3/4 B-body S.W. 63.40 All 9 1/4 C-body