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1964 Axle Codes
1965 Axle Codes
1966 Axle Codes
1967 Axle Codes
1968 Axle Codes
1969 Axle Codes
1970 Axle Codes
1971 Axle Codes
1972 Axle Codes
1973 Axle Codes
1974 Axle Codes

1964 GTO Axle Codes

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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

A sticker with the code was applied to the left brake drum.
The color code was painted on the top of the rear end and axle hubs.
The ratio was stamped on the right rear axle tube.

1965 GTO Axle Codes

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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

A sticker with the code was applied to the left brake drum.
The code was also stamped on the axle housing directly to the right of the carrier case and below the brake line clip.

1966 GTO Axle Codes

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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

A sticker with the code was applied to the left brake drum.
The code was also stamped in the axle housing to the right of the carrier.

1967 GTO Axle Codes

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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

A sticker with the code was applied to the left brake drum.
The code was also stamped in the axle housing to the right of the carrier.

1968 GTO Axle Codes

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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

A sticker with code was applied to the left brake drum.
The code was also stamped in the axle housing to the left of the carrier.

1969 GTO Axle Codes

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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

A sticker with the code was applied to the left brake drum.
The code was also stamped in the axle housing to the left of the carrier.

1970 GTO Axle Codes

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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

* These ratios were offered with the optional 12 bolt rear end(455 only)
A sticker with the code was applied to the left brake drum.
The code was also stamped in the axle housing to the left of the carrier.

1971 GTO Axle Codes

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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

* These ratios were offered with the optional 12 bolt rear end.
A sticker with the code was applied to the left brake drum.
The code was also stamped in the axle housing to the right of the carrier.

1972 GTO Axle Code

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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

* These ratios were offered with the optional 12 bolt rear end.
A sticker with the code was applied to the left brake drum.
The code was also stamped in the axle housing to the right of the carrier.

1973 GTO Axle Codes

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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

A sticker with the code was applied to the left brake drum.
The code was also stamped in the axle housing to the right of the carrier.

1974 GTO Axle Codes

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Differential Ratio

Non Safe-T-Track Sticker Code

Safe-T-Track Sticker Code

2.73

JA

JM

3.08

JB

JN

A sticker with the code was applied to the left brake drum.
The code was also stamped in the axle housing to the right of the carrier.
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Updated August 16, 1996

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