I have no idea but maybe if you put your vin on here and go to the drivetrain section, it will tell you?

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Look for an identification tag on the differential. Normally it’s located on the right side (passenger side) on the neck.

 

Axle gear ratio? Are the pinion seals different between the tow package and non tow package Titans?

 

The parts store told me there’s a difference in models. I put down my vin on autozone.com and got the two parts. Each part has a part nunber. Would this part number be the same at any store/dealer?

 

There is only one axle housing and the inky difference between axles is whether or not you have the e-locker as it takes unequal length axles, where the open diff takes equal length axles.

There is no difference one to the next as pinion seals go - at least not within the same year (unless there is some crazy mid-year switch of parts or something, but I think the pinion seal didn't change from 2004-2015).