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Mark,

Those marks are from factory machining.

Tony's site has a step by step on checking endplay, click here .

Bill Ball

I saw the same thing when I did my oil pan gasket. Everybody has already chimed in with the answer. The machining can fool you. If you didn't have a chance to observe the condition of the thrust bearing, do the end play measurement to reassure yourself. Pictures of real TBF show more damage.
http://members.rennlist.com/v1uhoh/9...earticleTH.pdf