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Message: <blockquote data-quote="Cal BM1" data-source="post: 30330" data-attributes="member: 11171"><p>Dont know about a 23 but my 21 trans.filter is part of the block and not changeable. I took my car to the dealer for a trans.service and told the service writer that since he told me they changed the fluid and filter that I wanted the old filter. The writer about had the big one. I had gone to Auto Zone to buy a filter, and they were the ones to smartened me up. Another real stupid idea just like the sealed transmission that isn't really sealed and fluid for life. No wonder GM has transmission issues.</p></blockquote><p></p>