Join Date: Sep 2007
Location: SF Bay Area
The the back diff, the trans/transfer case, the steering box and the front diff are aftermarket add-on. Unless the dealer offered them as options. Some TJ models came with a thin metal gas tank cover and some with a more heavy duty item, a "skid" of sorts that was okay. My TJ came with a formed metal gas tank skid with reinforcement ribs on it, front to back, and it was a factory item. It's taken some abuse over the years and has many dings and dents in it, but it's held up well.
'02 TJ Sport, ARB's, 4.88s, NV241, Nth 6in LA, D44's, 35in KM2's, rear discs, Antirocks,
Warn XD9000i, Superior Evolution, and caught fire only once, N7YMZ