I had to have a cracked overdrive retaining ring replaced and with 133K, decided to have a transmission rebuild. The shop that is doing the work hasn't done a rebuild on this version before. The underside of the truck was pretty dirty and looked well used. The shop is not sure if the transmission crosmember is manufactured to have the underside concave up, or if the previous owner bottomed out and bent the crossmember. Does anyone know if the crosmember is concave?