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It is called a 545rfe. It is the same as the previous 45rfe from what I understand but has different "software" so it has an additional overdrive gear all by software, no mechanical differences. Also, I understand it is the same as the later 65rfe which is the same transmission as far as mechanically and software but they renamed it to call it a "six speed" for marketing purposes.

Hope this helps.
 
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