Initially, on the '04 models the VDC came with the Bbig Tow package no matter what other option packages you had (4WD, OR, etc.). However, once the E-locker was introduced mid-year, you could not have the VDC along with it, even if you had the Big Tow package. At the time, Nissan's explanation for why you could not have both VDC and E-locker on the same Titan was that it was not cost effective. I've heard no other explanation since.
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