just use the grease that you use on the bolt that go in the brake caliper. you can get it at autozone for like less then a buck. comes in a trojan condom wrapper size packet. itll keep it from rusting or sweeking in there.
Dana 44 Front 60 Rear
TeraFlex - LCG Max Kit, SYE, 2-Low Kit, High Steer Kit w HD Tie Rod, Dual Rate S/T Sway Bar
FAB Tech Front Bumper
Poison Spider - Fenders, Roll Cage
37x12.50x17 Pro Comp Mud on 17" Pro Comp Steels
If anything, the grease you put on the bolt to keep them coming off easy, about once/twice a year, will keep them FROM squeaking than if you left them on Take em off any have fun. don't forget some cheap mirrors though. Its drivable without them because the Jeep is so good, but on major busy highways it can keep a little hairy. The mirrors just make the drive a little nicer. Theres a right up on 4x4xplor.com on cheap mirrors
Biggest problem you are likely to cause yourself by removing the doors is the reluctance to put them back on when the weather is uncooperative!
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I took my doors off UH, long time ago and haven't put the nuts back on. Heck maybe I lost them.
I think the seal hes talking about is some kind of thin almost copper like disc that sat on top of the hinge. I don't recal if I ever did anything with mine other than spraying the hinge and shaft with a silicon based spray before I put the doors back on.