Better description of the problem needed. "I shift the transfer case from 4HI to 2HI and the jeep stays in 4wd". Or: "The light says I am in 4wd, but I have shifted into 2HI."
Could be a multitude of things: First you need to confirm that you are really still in 4wd or if the light is just stuck on (bad switch). If you are truly stuck in 4LO fr example...I would guess a TC linkage problem.
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