4wd changes to multimode for all trims in 2001 with the center diff lock and 4hi changing from lever locations to dash buttons. Front axle actuator changes to an electric motor so no more VSV for ADD. I think there was some fuel sender changes as well as the charcoal canister and emissions stuff got moved to behind the rear axle tucked up under the body. Throttle bodies changed. Transmission line pressure/kick down cable went away. That's about all the major changes I can remember right now.
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