« Reply #2 on: April 18, 2011, 09:44:08 PM »
It would seem that the color of paint on the end of the stud indicated the length of the stud while the slash mark painted on the end of the axle indicated the number of splines on the differential end of the axle. This info was taken from the December 1992 issue of Mustang Monthly and the title is "Detailing a Mustang Rear End"
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John Murphy
1965 "K" GT fastback Honey Gold exterior, Ivy Green and White Pony interior, many options
1966 Conv., high option, removeable hardtop, thermactor "C" engine, AC, Springtime Yellow exterior, Black Pony interior
1968 California Special, "J" code, ,many options, white with red interior