In addition to the advice given make sure 5/16 is the right size bearing. I rebuilt a gear box in similar condition to yours and at first sight they looked to be 1/4, but after trying 1/4 I found I had more gap than with the old bearings, I measured some of the old ones and found that they were more than a 1/4 but smaller than 5/16 to varying degrees. Tried a second time with 5/16 bearing and I came out pretty even. Yes pitted balls could cause your binding issue. In regards to your shims, that will probably be trial and error on your part. Since you say that you have a different number of bearings in each race, that would lead me to believe that the box has been opened before, so the shims may have been adjusted. Without seeing it I assume the shims adjust the end play or "slop in the bearings. If so, when you put it all back together, if the box turns hard (remove a shim), or if it has more than a 1/16-1/8? of end play (add a shim). More than likely new bearings, grease, and oil and you will be good to go. HTH
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Today's Featured Article - A Lifetime of David Brown - by Samuel Kennedy. I was born in 1950 and reared on my family�s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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