Have been down that road a couple times with our even heavier 1480 combines. The final drive cases are weak so they spread and do not hold proper preload on the wheel bearings, shortning their life. also the early axle designs were weak, the 2 piese axle / flange assys with 1 or 3 retaining bolts were especially bad while the latter 1 piece (rough back) axlees were better, but still cracked off at the flange.
the replacement (smooth back) axle shafts have more metal inthe transition from axle to flange and are much stronger. I have never had a smooth back axle fail.
In a discussion of this problem on another site, I addressed this problem and posted pictures that explain the problem and the fix.
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