1999 Suzuki Grand Vitara Q&A

1999 Suzuki Grand Vitara Question: What's wrong with my 4x4?

When I put my car in 4H, it clunks really loud and makes a really loud whining sound (kind of like when you need to shift a manual). The rpms are high too. It also feels kind of like its strugling too. When I take it out of 4x4, it makes a loud clunk again and then everythings fine. I just put oil in it because I thought that was the problem. Turns out its not. Please help. -
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