I have some of the Renegade Axels that are no longer made I want to fool around with someday when I do a conversion on my old Eska Ertl IH Payhaulers. RC4wd do still have some of the rear differential spools in stock. They come with the dog that locks them too.
http://store.rc4wd.com/Renegade-Axle...ff_p_2869.html