More guesses: I'll go with `open' or `Sure-Grip' differential for the white mark and "torqued" for the yoke nut with the blue. But your marks are WAY too neat for an assembly line axle ! Remember everybody on the line had multiple things to do during each assembly line cycle, and putting those paint marks on was just one of many. Probably the last thing the operator did before the line cycled and the axle was gone. A quick grab for the paint dauber, hit the axle and put it back to move on to the next job.
I think red was Chrysler's internal marking for safety related items. That's why you see red on some of the fuel line fittings as well.
