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When I asked if a 351W would swap with a 351M I forgot to mention what transmision was behind the 351M. It came with a C6. I also didn't say that I was going to use the transmision that came with the 351W, which I am assuming is also a C6. Would the transfer-case that came stock behind the 351M,C6 work with the 351W,C6. thanks for the info from my last post and sorry for the left out info too. Would appreceate info on this question. Thanks again.
measure the total length of the two trannies, if they are the same, and have the same output shaft style, you are golden. ford used the FMX and other variations of it behind the 351w in some bodystyle cars. but it is usually a direct swap with c-6s with the sliding yoke.
the gear-selector lever may need to be changed if full-size, it will need to be swapped if LTDII. LTDII may have an FMX trans, the full-size will almost always have a c-6
the c-6 has a solid one piece aluminum case, the FMX/BORG-WARNER trans has a seperate bellhousing, and an iron case.