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1964 GTO Axle Codes
Differential Ratio |
Std. Axle Code |
Std. Axle Sticker Code |
Std. Axle Code Color |
Safe-T-Track Sticker Code |
Safe-T-Track Color
| 3.08
| D
| 2D
| Orange
| 3D
| Green-Yellow
| 3.23
| K
| 2K
| Brown
| 3K
| Green-Brown
| 3.36
| E
| 2E
| White
| 3E
| Green-White
| 3.55
| F
| 2F
| Blue
| 3F
| Green-Blue
| 3.90
| H
| 2H
| Plain
| 3H
| Green-Plain |
The following ratios were available with heavy duty metallic brake linings.
Differential Ratio |
Std. Axle Code |
Std. Axle Sticker Code |
Std. Axle Code Color |
Safe-T-Track Sticker Code |
Safe-T-Track Color
| 3.23
| L
| 2L
| Brown
| 3L
| Green-Brown
| 3.36
| M
| 2M
| White
| 3M
| Green-White
| 3.55
| N
| 2N
| Blue
| 3N
| Green-Blue
| 3.90
| P
| N/A
| N/A
| 3P
| Solid Green
| 4.30
| N/A
| N/A
| N/A
| N/A
| Black |
1965 GTO Axle Codes
Differential Ratio |
Std. Axle Code |
Std. Axle Sticker Code |
Safe-T-Track Sticker Code
| 3.08
| D
| WE
| YE
| 3.23
| K
| WF
| YF
| 3.36
| E
| WG
| YG
| 3.55
| F
| WH
| YH |
The following ratios were available with heavy duty metallic brake linings.
Differential Ratio |
Std. Axle Code |
Std. Axle Sticker Code |
Safe-T-Track Sticker Code
| 3.08
| G
| XB
| ZB
| 3.23
| L
| XF
| ZF
| 3.36
| M
| XG
| ZG
| 3.55
| N
| XH
| ZH
| 3.90
| P
| N/A
| ZK
| 4.33
| S
| N/A
| ZL |
1966 GTO Axle Codes
Differential Ratio |
Std. Axle Code |
Std. Axle Sticker Code |
Safe-T-Track Sticker Code
| 3.08
| F
| WE
| YE
| 3.23
| G
| WF
| YF
| 3.36
| H
| WG
| YG
| 3.55
| K
| WH
| YH
| 3.90
| P
| N/A
| ZK
| 4.33
| S
| N/A
| ZL |
The following ratios were available with heavy duty metallic brake linings.
Differential Ratio |
Std. Axle Code |
Std. Axle Sticker Code |
Safe-T-Track Sticker Code
| 3.23
| M
| N/A
| ZF
| 3.36
| T
| N/A
| ZG
| 3.55
| W
| N/A
| ZH
| 3.90
| P
| N/A
| ZK
| 4.33
| S
| N/A
| ZL |
1967 GTO Axle Codes
Differential Ratio |
Std. Axle Code |
Std. Axle Sticker Code |
Safe-T-Track Sticker Code
| 2.78
| D
| WC
| YC
| 2.93
| E
| WD
| YD
| 3.08
| F
| WE
| YE
| 3.23
| G
| WF
| YF
| 3.36
| H
| WG
| YG
| 3.55
| K
| WH
| YH
| 3.90
| P
| N/A
| ZK
| 4.33
| S
| N/A
| ZL |
1968 GTO Axle Codes
Differential Ratio |
Std. Axle Code |
Std. Axle Sticker Code |
Safe-T-Track Sticker Code
| 2.78
| D
| WC
| YC
| 2.93
| E
| WD
| YD
| 3.08
| F
| WE
| YE
| 3.23
| G
| WF
| YF
| 3.36
| H
| WG
| ZG
| 3.55
| K
| WH
| ZH
| 3.90
| P
| N/A
| ZK
| 4.33
| S
| N/A
| ZL |
1969 GTO Axle Codes
Differential Ratio |
Sales Code |
Non Safe-T-Track Code |
Safe-T-Track Code |
H.D. Safe-T-Track
| 2.56
| C
| WB
| XB
| N/A
| 2.78
| D
| WC
| XC
| N/A
| 2.93
| E
| WD
| XD
| N/A
| 3.08
| F
| WE
| XE
| N/A
| 3.23
| G
| WF
| XF
| N/A
| 3.36
| H
| WG
| N/A
| XG
| 3.55
| K
| WH
| N/A
| XH
| 3.90
| P
| N/A
| N/A
| XK
| 4.33
| S
| N/A
| N/A
| XM |
1970 GTO Axle Codes
Differential Ratio |
Sales Code |
UPC Code |
Non Safe-T-Track Axle Code |
Safe-T-Track Code
| 3.07*
| R
| GX1
| WT
| XT
| 3.08
| F
| GU4
| WE
| XE
| 3.23
| G
| GU5
| WF
| XF
| 3.31*
| T
| GX2
| WU
| XU
| 3.55*
| W
| HO2
| WH
| XH
| 3.90
| P
| GU8
| N/A
| XK
| 3.90
| -
| -
| WK
| YK
| 4.33
| S
| GU9
| N/A
| XM
| 4.33
| -
| -
| N/A
| 7N |
1971 GTO Axle Codes
Differential Ratio |
Non Safe-T-Track Axle Code |
Safe-T-Track Code
| 3.07*
| WT
| XT
| 3.08
| WE
| XE
| 3.23
| WF
| XF
| 3.31*
| WU
| XU
| 3.55
| WH
| XH
| 3.55*
| WV
| XV
| 3.90
| N/A
| XH
| 3.90*
| N/A
| XK
| 4.33*
| N/A
| XM |
1972 GTO Axle Code
Differential Ratio |
Non Safe-T-Track Sticker Code |
Safe-T-Track Sticker Code
| 3.07*
| WT
| XT
| 3.08
| WE
| XE
| 3.23
| WF
| XF
| 3.31*
| WU
| XU
| 3.55
| WH
| XH
| 3.55*
| WV
| XV |
1973 GTO Axle Codes
Differential Ratio |
Non Safe-T-Track Sticker Code |
Safe-T-Track Sticker Code
| 3.08
| AD
| CD
| 3.23
| AE
| CE
| 3.42
| AJ
| CJ |
1974 GTO Axle Codes
Differential Ratio |
Non Safe-T-Track Sticker Code |
Safe-T-Track Sticker Code
| 2.73
| JA
| JM
| 3.08
| JB
| JN |
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Updated August 16, 1996
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