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In both assemblies the ring and pinion and housing were from the same car(junk yard) After the original the original one broke the pinion teeth, i put the differential in a new(used) housing with the corresponding ring and pinion and had all of the bearings replaced and the spacing and back lash set at a local reputable performance shop. I assumed that improper installation was the culprit in the original one( purchased assembled, used from someone local). Is it possible that excessive heat generated by the differential itself is causing the fluid to break down prematurely and cause the gears to wear and possible loose their temper(hardness)? I am running a smooth s14 rear cover. The original unit began making noise before the first fluid change. There was no metal at all in the fluid upon draining.
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