The replacement part is about $700. Its the entire carrier system that the sunroof slides on. Labor to r/r the headliner will easily be 6 hours if not more.
It can be done with simple tools in your garage and a LOT of patience. A helper doesn't hurt. Take pics before & after, bag/tag parts and don't get too frustrated.
The good part of this is that in the r/r process, you can also reclaim the extra 2-3 inches of sunroof opening that was removed after the 99 model year. Your sunroof will open to full opening of the roof instead of stopping short and limiting the opening size.
There's a caveat to the larger opening, however, (that I can provide info on if requested) but I think it's no big deal.
Word to the rest of you to lube up the sunroof slide tracks as your days of open roof cruising may be numbered and don't even think of using a boneyard unit to save $. That unit has the same amount of wear yours does.
2000 Laredo 4.7L Selec-Trac. 177K miles, Leather, 245 tires, tow package, crappy CD changer, full size spare, roof cross-rails & sunroof.
Changes & fixes: Rear Addco sway bar & greasble bushings, upgraded headlights, upgraded tail lights, new hood struts (replaced 2X), new rear hatchglass struts, new radiator (replaced 3X), new oil pressure sending unit (replaced 4X), 2 new speed sensors, 2 new door lock actuators, new ignition key cylinder, chrome front tow hooks, Mobil 1 Synthetic 5/30, Purolator Pure One oil filter, EBC slotted & dimpled rotors, EBC Greenstuff pads, new front shocks (replaced 3X), new rear shocks (replaced 2X), new IRO steering stabilizer, new timing chain cover, new water pump, thermostat, new thermostat housing, new high pressure power steering hose, Michelin-X radials, new sunroof assembly, new single-piece lug nuts, new exhaust manifold studs & gasket on driver's side, new Durango alternator. Jeepforum.com sticker, Visit cobaltboatsforum.com when you can!