I had a similar problem a few months ago that was driving me nuts for about a week. It ended up being the springs that support the foam portion of the bottom seat cushion for me (The flat springs that are flush up against the foam...and tie into the seat frame). I hit them with some WD-40 all over...front, back, middle, edges...until the squeak went away. Ill also add that at no time did the squeak sound like it was coming from a spring under the seat. Originally it sounded like it was coming from the seat back hinges and would squeak when I went over bumps...eventually I just stuck my head under the seat and started thrashing and pushing on the seat with my hand/arm until I pinpointed it. Hope it helps!
-Ryan
_________________
2004 - Black Limited
Pro.FIT XM Radio Mount
Garmin c330
Cargo Shelf
Warn SDB-160 Driving Lights
5 MOAB's with Firestone Destination A/T's
245/70/16
