transfer case 2-3 shift clunk

[colinmacdon]

'07 F350 crew cab 4x4 with ESOF. I am noticing that when the truck is in 4x4 hi, under moderate acceleration I can hear clunk/pop sound when it shifts from 2-3. The sound appears to be coming from underneath the drivers seat (transfer case?). I have heard the TSB on the 2-3 shift sound from the tranny, but in 2wd this sound is not present at all. Hubs are set to auto, 4x4 enages, disengages fine.
Any ideas? Bad u-joints on the front shaft causing excessive play?

[SixStringMadness]

I have the same clunk in 2WD, the TSB "says" it normal, but I don't like it....