Editing Pilot bearing and bushings (section)
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==Damage caused by a pilot bushing containing iron == {| |[[File:New input shaft.jpg|thumb|center|250px|New input shaft]] |[[File:Galled input shaft.jpg|thumb|center|200px|Badly galled input shaft caused by seized pilot bushing containing a high amount of iron or steel]] |} Somewhere in the shaft's life (above), it has been used w/a pilot bushing that contained an iron/steel bronze compound by the looks of it. A pilot bushing containing a good amount of iron or steel in the material's composition can and will cause this type of galling. It comes from microwelding of the shaft to the bushing under extreme conditions of heat and load. An all bronze oilite bushing is basically incapable of such damage; the bronze being softer than the shaft causes the bushing to be sacrificed instead of the shaft. ===Needle bearing (rolling element)=== Unless these are original equipment, it's not usually advisable to use them in place of a sintered bronze pilot bearing. If a rolling element type bearing is going to be used, it's imperative that the bellhousing opening to transmission input shaft alignment be within 0.002" to prevent premature bearing failure. In the case of a bronze bushing type bearing, there is more leeway for any misalignment. It's been stated that the roller needle bearing has a Rockwell hardness of about 57 and the newer transmission's gears are rated between 61 and 63. In cases where the input shaft may be 'softer' than the needle bearings (like possibly in older transmissions), there is a chance undue wear could occur to the input shaft, possibly necessitating replacement. {| |[[File:Lakewood pn 15977w needle element sintered pilot bush-brng.jpg|thumb|center|225px|Lakewood p/n 15977]] |[[File:GMHD pn 14061685 needle brng pilot brng.jpg|thumb|center|360px|GM p/n 14061685]] |[[File:GM HD pn 12577583 sealed pilot bearing.gif|thumb|center|225px|GM p/n 12577583]] |}
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