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The 6-64E-R06 is an F6TF-WC PCM, if it's till the original. My 96 F150 had the same sticker - 6-654E-R06. Should have been a F6Tf-WC, and it still showed that on the PCM's sticker, but my SCT tuner showed that it had been updated to a F6PF-AWA, but the door jamb sticker was still the R06. Here's some more info:
YEAR MODEL ENGINE QUALIFIER DEFAULT STRATEGY CAL_ID PTYP CALNUM EPARTNUM CHKS FILESIZE