howdy Mike,I was thinking on that line about the chevy cross member mount.I don't know if I want to remove the original gmc mount to put in the chevy mount.I'm not sure if the bolt centers of the two mounts are different or the same will look at it tommorrow.I did'nt notice either if the frame rails are parallel or tapered.I thought I could put a thick piece of steel plate in there to span the space and put large bolts through the steel plate and cross member and then drill holes in the rear side of steel plate for mount to set on.will look at it again tommorrow.thanks

bob black