Differential Nut Removal

[JMFarley50@aol.com]

Am attempting to remove the nut from the differential input to replace the  
oil seal.  The damn thing won't budge, even using a 1/2" impact  wrench.  There 
are not enough exposed threads to tell, but I assume that it  is a standard 
right-hand thread?  My next step is to try an impact wrench  with more torque.  
Any other suggestions?
 
Thanks,  John