i have no experiance with them,but from what i understand if you dont use them the driveshaft will fall out.once you lift your jeep that much the drive shaft is pulledd out of the transfer case a bit.when wheeling the travel of your rear axel can pull it out the rest of the way.

out of all the jeeps in this town the d**n gremlin had to invade mine

I've done so much,with so little for so long i can practicly do anything with nothing