To rejuvinate collapsed door gaskets, insert foam caulk backer rod. Larger foam will fit, but this is sufficient, and fairly easy to install. I was able to push about 5 feet directly in, and then use needle-nose pliers through the vent holes to pull the rest through. A long wire fed through beforehand would have made pulling the rod in even easier, but eventually the rod will have so much drag that it tears apart.

Any leftovers can be used in the doors:

. .

Immediately after this, the doors should be fully aligned to prevent further damage to the seals.
http://www.fourdoorbronco.com/board/showthread.php?6884-Door-Alignment

Finally, apply silicone spray lube &/or teflon dry lube to the gaskets to keep them soft, clean, and silent.

Owner caption December 2012 · Photo 4860 of 5000