Considering you're a Jr. Member with way more posts than you have merits, I'm curious as to why you started up a thread asking this question.  Are you actually going to delete all of your posts without abandoning the forum?  That's the only reason I could see as to why you'd be concerned about keeping your rank, and if you were going to leave bitcointalk altogether it doesn't make sense why you'd care.

I think this question had been answered in similar threads, but I can't say I blame you for not trying to search through Meta looking for the answer.  The search function here is one of the things that really should be updated from the 2009 era.  Lol.