Are you asking about the "kind" of rear
or the kind of springs??
I believe that the underlying issue here is clearly asked as to the REAR differential and that the member has out-rightly asked about the REAR differential and how to identify it. Is it that hard to identify what the member is asking.
How about a little reading and comprehension commitment.
Now if anyone wants to address the springs again how about this:
NO THE MODIFIED SPRINGS WILL NOT WORK. AT A MINIMUM THEY WILL HAVE TO BE RETURNED TO FACTORY SPECIFICATIONS.