'68 Firebird Axle
"Before" shots of the original Code ZB 2.56 Locking (Safe-T-Track) differential and axle.
Yellow paint?
"After" shots of the original Code ZB 2.56 Locking (Safe-T-Track) differential and axle.
Where are the codes on the axle?
Code Location
Axle Vent
With help from fellow 1st Gen enthusiasts, I found that the small hole  in the axle tube (left" had the sheared off remains of the factory axle vent. A new Ames vent is now in place on the right.
I have attempted to duplicate the yellow inspection marks seen in the before shots.
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