I do not think anyone can make a knowledgeable decision on the possible damage that has or has not affected the ability of that spindle to remain in service from that picture. I have seen hundreds of those spindles on GM one ton chassis of a former employer I worked for. These were on delivery vans and granted the models I worked on were 77 - 92, but I do not think the spindle set up has been changed much on this newer model. I think there is a heat treatment process that is part of the production process of those spindles that make many of them look like they have been hot. I will say that the discoloration I have seen is mostly on the rough machined and forged area between the machined bearing journals. Now if there is heat discoloration and galling on those machined areas that would warrant a closer inspection. I am more concerned to know if the outside of the races are fitting tight in the hubs. A lot of those hubs in replacement rotors do not have the best tolerances and I have seen them not have the proper press fit. Some I saw had a few high machining lines that held the race snug at first, but after rolling with weight on them and a few heat cycles the races then came loose. You just cannot be sure of the quality of parts you get even from reputable sources. Now if the parts installed were purchased based strictly on an economy price all bets are of. If I could see the spindle with my own eyes and felt it was acceptable for service I would drag a weld rod over the area and work down the arc strike BBs to get the bearing to fit snug again. With this method you actually add metal instead of the center punch method that just displaces metal on the surface. My two cents of course the value of it may equal what you are paying for it.
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Today's Featured Article - Fasteners: The Nuts and Bolts of Nuts and Bolts - by Curtis Von Fange. The nuts and bolts of nuts and bolts is an interesting and essential piece of knowledge that applies to our older tractors. An improperly torqued capscrew on an engine head or a shear bolt that is too hard on the driving shaft of a bushog can create havoc and make an expensive and uncalled for repair. Let�s examine the purpose and design of these fasteners in order to ensure their proper use. Fasteners are probably one of the aspects of mechanics that is given the least amount of thought.
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