I am working on detailing my 68 9 inch differential. The appears to be some writing but I can not make it out. Has any one seen this or can read it?
Guess your referring to the markings on the bottom of the third member - in your example in green.
Yes seen it many times and have a fair number of pictures of it. So far it appears to have started (at least from the examples I have) during approx mid year 67 production and is one of two different styles I've seen applied in that location which might suggest a workers in-house preference (at the Sterling plant) rather than a standard practice by all.
Looking at yours and other 68 examples the three center markings in my opinion are V4H Not sure if those are vertical lines to the left and the right but the others I have like yours have the same colors and marks at the ends and they don't seem to be legible. Maybe they were not suppose to be but for another purpose or habit
Looks like some of your other markings are a result of other (not visible) marks but pretty typical of what I've seen and collected for decades. The lavender on the pinion retainer I've not seen often