I wouldn't worry. The Titan is a good truck and the number of differential failures are relatively low and contained mostly to people with E-lockers. Not to say that it's not a weakness of the truck, but that if you took a poll here you'd find far more people have never had any trouble out of their differential. Leaking axle seals, now that's another story. Do the axle vent mod, which may not keep them from leaking but will certainly be helpful.
Velcome sir. I would also mention that manifolds crack over time and are a known issue with the Titan, and the stock radiators are kinda crappy. Luckily you have a 2012 so you don't have to worry about about right now.
any tips to removing the tailgate cap..mines really cut up ...going to replace it with a oem cap (since the rest of the truck is in excellent shape)..do i need screws or clips, tape, etc?
thanks