Definitely disconnect the driveshaft, its four easy bolts, should be 12mm wrench for the center bolts and 14mm wrench for the bolts at the differential, and if its not a manual then you'll need a long screwdriver or the lug wrench with the pointy end to jam in the driveshaft u-joints to prevent them from spinning while you are loosening. Only use a regular wrench, ratcheting wrenches won't fit. The differential bolts are the ones that you should remove, then bring some tie wire with to tie the driveshaft up out of the way.