Yes, the quality of the bearing was also mentioned by some as a possible reason for the short life. Other thoughts expressed were that the steel bearing may not have been a true thrust bearing but more like an axial bearing. Others stated that side to side alignment may be more critical than for the graphite and if the yoke is not properly aligned failure would occur more easily with the steel bearing. Also on the forum someone posted a picture of an interesting arrangement but no one was witness to how it was actually installed. The picture taken through the inspection hole in the bell housing showed an original graphite bearing housing in the yoke and a steel thrust bearing in front of the graphite housing, which no longer had any graphite extending out of its housing. It looked like the steel thrust bearing may have been "floating" on the drive shaft in front of the old graphite housing, which was only used to push the steel thrust bearing against the fingers. This arrangement was reported to be working OK. I assume the thrust bearing had a collar through its center. If the collar just fit loosely over the drive shaft, it would move straight fore and aft on the drive shaft and may be a way to overcome any alignment issues.
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Today's Featured Article - Ford N-Series Transmission/Hydraulic Fluid - The Full Story - by Llamas. The transmission fluid in an “N”:-series tractor lubricates the transmission, differential, rear wheel bearings, PTO and hydraulic pump drive, and it also cats as the working fluid for the hydraulic lift. In 9N/2N models, it also lubricates the steering sector and shaft system. The owner’s manual for the 9N and 2N models specified the use of only two fluids. They were STRAIGHT MINERAL OIL SAE 90 (above freezing) and
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