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Message: [QUOTE="Dave_Nevada, post: 1499459, member: 29749"] I have noticed the same chewed up input shaft problems with many other manufacturers that run needle bearings. It seems to be a common problem across the board. BTW- I have this input shaft mounted on my lathe. I think I'll turn the sleeve off to see how bad the surface is under it. These sleeves are pretty soft in comparison to the needle bearings, and I know darned well they distort under the torsional pressures applied to the input shaft. Just how much they distort is the question. I'm not taking my measurements of the sleeve (in my case) as the gospel to conclude as to what is actually happening. But I will tell you this- when the un-scored portion measured at .811" and the contact surfaces varied in diameter .807 to .806, there's something seriously amiss. The possibility of the sleeve being pressed down (distorted) by the new pin bearings is suspect. Along with the needles running out of lube, it is easy to see why the sleeve is a joke when it's installed with the provided needle bearing. There's another scenario I'd like to monitor: Running a sleeve with a bronze bearing. Does it distort the surface of the sleeve? If so, how much? Remember, we are dealing with 500 ft lbs torque from this engine. it's not hard to imagine the negative affect on an 'oblong' or 'out of round sleeve. Anyway, if one of you has your ZF6 input shaft out of the truck and you have an analog or digital mic, could you share your measurements all along the sleeve? If it's not gouged, a total run-out (roundness) measurement would be great. Thanks a bunch. [/QUOTE]

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