Review of the MF 6615 Dyna4 & MF 6616 Dyna6 Feb 15, 2016 9:27:04 GMT -6 Quote Select PostDeselect PostLink to PostMemberGive GiftBack to Top Post by Admin on Feb 15, 2016 9:27:04 GMT -6 Independent Review of the Massey Ferguson 6600 Series. Check out the Dyna4 & Dyna6 Transmission Choices for more economical costs but still high on performance.