Sorry to hear about your ordeal, I really hope DC does the right thing for you.....
one other thought that I haven't seen expressed here is additional damage to other key components in your truck, i. e. your transmission, TC or anything else that is between your engine and the rear axle... ...
the lock up of that axle could have damaged other internal parts of any of those parts, thus casuing them to fail prematurely down the road... ...
If it were me I would do just what you are doing and ask for an exchange, I wouln't want to chance dealing with future issues that might arise because of this incident,
and if I were the dealer I would not want to deal with future issues either, and I would be helping you talk DC into another truck and into taking this one back for autopsy... . let us know what happens...
kerryp
bastrop, tx.