I'm in the middle of putting a 42 RH in my 70 Dart. I'm using the USCT crossmember. In my experience it is a great place to start, but it cannot be used as it arrives. The same clearance issues, especially on the driver side, for the cross member that runs above the trans, means that the USCT cross member has to be substantially revised including, as seen throughout this thread, moving at least the drivers side inside crossmember mounting bolt. What I do like about starting with the USCT unit is that it is really beefy throughout and really takes a lot of the support function that is compromised in cutting away a bunch of the upper frame member. Just remember that, like a Chrysler C-body which has no frame above the trans - WHENEVER YOU REMOVE THE TRANSMISSION CROSSMEMBER AND THE SUPPORT IT NOW PROVIDES, YOU HAVE TO FIRST TAKE THE LOAD OFF OF THE CROSSMEMBER BY UNLOADING THE TORSION BARS.This isn't usually a big deal - how often do you take your trans out??? - but it is really important. It is also why, if you build your own crossmember, it needs to be a lot more structurally sound than the factory piece.
