hey guys i have been informed on the locking diff that the option will only be able to be activated in 4 wheel low only. no other setting will it activate. and since its electronic it will partially be controlled by the computer. hope this helps because i personally dont go off road enough and that vdc option on the tow package is awsome.i used it when it snowed in tn and drove to work in 2 wheel with the vdc, its great you definately will want that. 