Q: 4WD is not engaging on my1997 Chevy Blazer

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I recently discovered that my 4wd has stopped functioning. I have replaced both the actuator under the battery tray and the actuator valve on the transfer case and is still non-functional. I can hear the transfer case switching to 4hi and 4lo but it does not lock the front differential. What is weird though is if I want to go over a curb, I can put in in 4lo and I can feel the front wheels pull the truck over the curb. But if the rear wheels spin, it immediately disengages. I tried to get out of a muddy field and I put it in 4hi then 4lo but only the rear wheels were spinning. I don't know what else to check. I really need the 4wd since I live in a snowy region. Any help is appreciated.

My car has 98000 miles.
My car has an automatic transmission.

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