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When I ordered my 2003, the sliding rear window had nothing to do with the FX4 package. I don't see why it would now either, but if someone has a more recent ordering guide it's a pretty easy question to answer.
Must have dropped the sliding glass when the added the Rancho shocks then. Up to 01 the sliding window was a part of the off-road package, but the FX-4 didn't start until 02.
I know it comes on several different packages. Up through the 01 model the sliding rear was a part of the off-road package. I don't know why, I thught it was silly when I bought my truck, but it's a fact.