Take it in to a different mechanic, or the dealership. Tell them you've had a different shop give you what they thought was wrong with it. DO NOT TELL THE SECOND SHOP WHAT THE FIRST ONE SAID WAS WRONG. Just tell them you want a second opinion.
Also, you need to get clarification from AAMCO as to what EXACTLY they think is wrong with your transmission where they think it needs to be replaced. If they can't pinpoint it for you, then they're likely to be full of crap and just want your money.
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