I have rebuilt the knotters on both of these balers, and it is getting a little fuzzy in my mind what the differences are. I agree, I do think the parts are the same, but as I recall the main drive cross shaft is set up a bit different making the shimming of the drive gears easier on the 328. I have the 327 baler here in my shed, but the 328 is out at my son's place. So right now I can't put them side by side to compare. I think there was some difference in the wiper arms, making that adjustment easier in the 328.
If the "ball bearing" on the cross auger shaft is at the far right end (pulley side of the auger), then my 328 machine was cheated out of a bearing. I think it is a wood or plastic block and it has been a noisey hassle since we got it. We squirt 90 wt oil at it to quiet it down. The 327 definitely has a grease fitting there and it gets greased daily. Maybe the bearing you describe is located near the middle of the auger.
Both machines have stress cracks in the sheet metal at the right side of the pickup house. Some of the sheet metal was spec'ed to be too thin or too high strength (brittle) and has cracked from vibration.
I have personally met the lead engineer at JD who designed these 2 balers. He claimed that there was a real push from the corporate guys to have everything spec'ed in metric dimensions so that the same exact machine was being built in Europe and the US, but that the US steel suppliers were not providing metric thickness sheet metal at that time. The engineers knew what worked well, and were forced to make compromises to keep the management happy. One of the later compromises was to spec the thickness of sheet steel with a wide tolerance of +/- dimensions so that a standard US steel gauge would meet the specs. He is retired from JD now, lives in Iowa, and has grandchildren here in the Mpls area. It is fun finding out the battles the engineers faced as they designed a product and brought it to market.
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