So I have manual locking hubs on my Montero. I have an owner's guide that says that it has auto-locking hubs. Were auto-locking hubs standard or an option on the 1990? Did a previous owner switch them out on my vehicle? Also, occasionally when I am driving, the 4wd light comes on in the dash. Usually it will go off after I park and turn off the truck for a bit. It does come on when I put it in 4wd. Is that likely a sensor or a short, or something else. Not sure how to troubleshoot this.

Thanks,
Alex.

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AlexM.
Limited Mechanical Skills
'90 Montero RS 5-speed