Major update, except I forgot what I added. IIRC I added a RWD diff+T-case, a geared 3.89 LSD, one that can be locked (thanks Diamondback!) and some more things I forgot.
Completely rewrote for 2019. Gone is SixSixSevenSeven and AdamB's code, all transmissions aside from the CVT, and the transfer case options. For now, it only has a CVT and a part-time 4WD transfer case. 4WD on/off also has been fixed.
Fixed for 0.21. I suggest you get WBIMP if you want more differential options, because I deleted all front diff options and made the CVT usable with any front diff configuration.