Land of Enchantment GTO's

1964 GTO Rear 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

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.