I worked as a diesel engine mechanic for over 10 years and my experience on semi-tractor rear ends is limited. Most shops I worked at there was one and I mean only one gear man that overhauled them. Even at that they were using new matched rings & pinions and still would sometimes have one that would just howl !!!
Since any NOS ring & pinion set would be hard at best to find, let alone a matched pair, and I am sure you could buy another complete tractor for what they would cost, you have to settle for a bit of a comprimise.
I would set it back to the .015 backlash setting where the prussian blue impression looked good and let it " wear in". It will quiet down eventually.
I seriously doubt you would do much damage either way, but IMOP those gears are very hard, and running in 85-140 gear oil it will take a week or two of plowing hard ground to get them to wear much at all.
This post was edited by rhtx55 at 18:12:42 02/20/13 2 times.
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