Anyone know a way to tell the difference between 32 and 36 spline boxes without pulling the pitman arm? They are stamped (SPA-JN) for 32,..... but where as i can find no markings? And the ford # F7AC 3583-AA isnt specific to the splines...... Also wondering the the pitman arm can be changed to work with either? Some cross ref. has suggested many other vehicles even some half tons and even towncars? Thanks for any help