Grinding in 4wd only when turning

[Chuck Youngblood]

Guys, I'm sure this subject has been addressed many times but I could not find anything so please bear with me. My 07 Sierra 1500 classic has started grinding in 4 wheel drive and also starts to lock up at the slightest turn of the wheel. I know I can't make a tight turn on dry pavement in 4 wd but this is the instant I even start to turn. The grinding goes along with that and is LOUD. It never did this before. It has 186,000 on it but has run like a charm until this. I'm fearing transfer case and I really don't want to do that.

[karlmg]

You drive line or cv is binding up, thus producing a weird noise.

[Chuck Youngblood]

I just had an alignment done and now that I think about it this noise came around after that. I guess the alignment could have put things in a bind?