I agree cut the quick connect off and use a hose clamp. These fittings can be hit or miss. Some may consider this a band-aid type fit, but I have done it before and it works like a charm. Just make sure you tighten the clamp down nice and snug above the flare on the nipple.
1990 XJ d30/8.25 4.5" lift 32's, ZJ steering, Rusty's HD Trackbar, Solid Diff cover
1999 XJ stock DD