I am wondering if there is a misalignment issue between the output shaft on the hydro and the rear bearing support. A way to check would be to remove the shaft from the bearing support and slide a longer solid shaft through the bearing and check it. To FrankF3 has the rear end ever had problems with the mounting bolts breaking or the front support brackets coning loose and elongating the holes in the frame? On the 1872 I am working on all of the rear end mounting holes were wallowed out especially the front support bracket holes. They were slotted from wear about 1/4 inch. If that is the case the rear could be rotated enough to miss align the two shafts and cause excessive wear on the couplers. Might be something to check.
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