I have an 05 3500 and i am about to change the oil for the first time. On the front of the engine compartment there is a sticker to grease the front drive shaft when you change the oil. My question is whereon the shaft is the fitting or opening. Which end of the shaft? Frontor near the transfer case. Another question is what is the size of the hex wrench to open the fill plug to the 6-speed. I might as well do that while I am under it. Thanks for your help. Great truck so far(7800 mi. ) Oo.