I'm not sure... I've been running a Dynatraxx kit on my 05 for 80,000 miles. The factory "U" joints are still good with them not turning all the time they don't wear... . I did re pack them with grease when I did the free spin kit... . I don't see why you could not use the off Heavy duty road parts...
Question for all you guys with freespin hub kits. since the front will not be turning unless in 4x4, do you think for front u joints you could use the OX or other offroad heavy duty joints?