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Which TCM is best for A604?

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Will any flashable TCM work, or is there a particular part number that is best for a 91 New Yorker?

From my understanding any flashable one is fine as long as its updated, and it sounds to me like the newer part numbers simply shipped with newer software from the factory.

Is this the case? Is there any particular part number that is in some way better than another? Also, can I use a TCM out of a van or LeBaron or something, are those also compatible?

Thanks for any information to help me clarify this.