Tip on filter replacement:The removal and installation will go much easier if the clamp on the duct to the air cleaner lid is loosened which allows the lid to turn easier. If the clamp is tight, then you fight the air duct every time trying to turn the lid to remove/install the filter element.
The part numbers for the upgrade to 2000 suspension are as follows:
Front shock assemblies - 5264892AA (2 ea.)
(5290906AB 2001 PN)
Rear shock assemblies - 5264895AB (2 ea.)
(52909608AC 2001 PN)
Rear upper lateral links - 5264898AA (4 ea.)
The ball joints are larger and might require the frame casting to be relieved for clearance (minimal grinding).