While looking through my MM I read all the articles on a project car "Mobydoba", and they modified tha factory crossmember. I have the stock one in the Imp, plus the 727 one from the '85 Gran Fury Police car. For ease of installment, I may just install the 727; as I do have a 727, but don't have a 518. Has anyone ever used the 618? Being based on the 727 vs. the 904, isn't it inherently stronger? Is it a flex plate/torque converter swap? Plus electronics, is there anything else involved? Is a rebuildable core that much harder to find? Cost effective? In reading many different forum letters, it sounds like these swaps aren't completely ironed out. One article by PTA something or another (sorry, 8 yrs of OxyContin, & 5 more of Opana have MORE than taken their toll) seems close to a workable albeit not perfect system. Thank you, Larry