Keep hunting for a more rubust rear end. I've got a pile of 7 broken 7-1/4s behind my Mom's garage and a couple next to my shop. Anything that loads up one side abruptly will rip the spider gear shafts out of the housing. I've torn up a couple with slant sixes turning corners in ice/snow. I put 7-1/4s back behind the sixes but always upgraded the axles behind a V8 because of my experiences.
