One thing that has always intrigued me is that Chev guys mostly just like Chevs and not the others that came out of GM eg Olds, Buick, Pontiac.
Mopar guys however love Plymouth, Dodge, Desoto and Chrysler. You very rarely see a Mopar guy that owns a Plymouth rubbish a Dodge or the others. I think it has a lot to do with Engine and drivetrain sharing.
We are unique from the others and I think Mopar got it spot on in this respect. Also the name Mopar is all encompassing and covers all the brands under the Chrysler umbrella. It doesn't matter if you own a Dodge, Plymouth or Chrysler because in the end you own a Mopar. It is just like one big happy family.