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2001 Chevrolet Silverado HD transfer case np263hd problem

I have repaired and replaced the transfer case np263hd in a 2001 Chevrolet Silverado HD to fix a leak due to the pump rubbing a hole in the case. While I had the case disassembled, I also replaced the range shift fork, the hi-lo range hub associated with the fork, the mode shift fork, the chain, and most bearings and seals. When I put everything back together, I ran into a problem. The unit seems to work okay in 4-high and 4-low, but there is a problem with 2-high. The gears seem to barely be engaging, and when I accelerate anything much more than an idle, I hear a grinding/chattering noise in the transfer case. It sounds like certain gears are barely making contact, and are slipping under load. I suspect I may have installed something upside down or backwards perhaps the mode selector? Also, while the truck will shift from 2 hi, to 4 hi to 4 lo, it seems to have trouble doing it sometimes. Help?

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