Initial inspection of A500

That is strange. I always tap the shaft inward then pull it out with vise grips because the direct drum can lay cocked and throw off the reading. You can also get a fake reading when the endplay gets huge and a thrust washer falls out of place. I can appreciate that your procedure is correct so far, but with an unusual reading like that, that trans would have to have been assembled initially with end play below specs.
I’m thinking there is a chance the tranny may have seen some service in its day. The accumulator spring looks to be a HD version used in the A518 or common aftermarket replacment spring. This might explain the better than average end play. The tranny came from a truck with a dash fire from a bad stereo install. I’ll find out more after I get it running.

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