You don't have to, but it makes it easier to remove the drain plug while its still attached (they can sometimes be really tight) and just throw a catch pan or bucket under there. Otherwise, you will have to have a way to hold it down to remove it on a bench...like hug it.
A pair of lock ring pliers make life easy doing SYE's if you have or can borrow some. Just be sure to clean all the mating surfaces good, and I prefer to use Mopar ATF RTV, but Ultra Black RTV will suffice. Buttoning it all up only to find a leak really can make for a grumpy day! Just take your time and don't force anything and all should be well.
Yes you'll have to move it again. You'll want to point the pinion directly at the t-case output shaft for the new cv driveshaft. You'll probably run in to issues with the shock hitting the spring pad and the track bar location. I did with a 4inch lift anyhow. One mod lead to another lead to another leads to another...... Lol
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