Usually having a "clunk" upon shifting from park to drive or reverse is a worn transfer case motor gear.

Not saying that this is your problem for sure but I'd check it out and replace it or flip it if it's worn....

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"When the Team Chief said.... You're trapped in a hole with nothing but a goat and a slinky, what do you do? Stubby said, I'm not sure but it won't end well for the goat...." ~(Overheard) Last day, Phase 3, Q Course