If it is electrically actuated try getting out the trouble codes (DTC) with a dealer.
On older Chevrolet Blazer S10 Models the shift motor/encoder gets stuck and lets you shift only from 2HI to 4LO as an emergency program. Replace the motor/encoder.
sell it and buy an import.
Behind the kick panel on the passenger side is an electronic box, unplug the connectors and inspect for corrosion. They can be cleaned and reconnected in most cases. The box should be removed (3 10mm nuts) and cleaned also.
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I have a 4 wheel drive Chevy Blazer 2001 that got stuck in 4 wheel drive, the only way I got it out was to put it into neutral and switch the 4 wheel drive button. It worked!!
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When not used, they do get stuck and hard to shift. I had this with my 93. I put it in neutral and forced it into 4 wheel low. After it went, it is now easier to shift into.
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