Greetings. UPDATE-THE WD40 DID THE TRICK. SWEET!
I just obtained a (I think) 2000 Spec. Rockhopper Comp. The Deore lx shifter for the rear gears is the push/pull type.
Something is wacky with shifter or the deore xt derailleur as only the center four cogs can be shifted to. The shifter itself clicks properly through those four cogs, and if I keep shifting past those gears, the push lever just depresses with very little resistance and no clicking.
Here's the bike.
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