Checked the ATF fluid level and it's ok. Checked the filter and O ring and those are ok as well.

He has diagnosed the problem as a defective gear shifter module. $882 to replace new and $640 to replace with a used part. I would think this might be a part one shouldn't get used? Am I right or is the used module a fairly safe bet?

BTW, I noticed the locking pin for cap was missing on the ATF fill tube. Is it possible to buy that part?

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1999 ML 430