Well, maybe I'm the one that needs some info/background here. I've always looked at the subframe mounted units as just that: BH with subframe. If that's what everyone calls a "4pt" mount, then I'm remiss, not you guys. My 511 Bradco is a subframe mount that runs under the 00 series, bolts up to the differential and foward to connect to the front end loader frame hookups. Thinking about it, the BH does hook up in 4 points. If I've misinterpreted your 4pt, its my mistake. However, the warranty I'm talking about is the Mahindra warranty, not the Woods warranty. I'd consider the value of the 4500/5500/6000 tractors to be much greater than the hoe, in case of any issues. I was under the impression that Mahindra would cover tractor issues with the Bradco/Mahindra BH, but if you put something else back there, they wouldn't . Maybe I'm wrong there too. Can someone clarify?? BobG in VA