Seems like I've had nothing but problems with my 2002 S10 blazer. I'm no car expert, so I tripped upon this forum. Thought I may get help from people who know what they're talking about. Here goes...
About 2 weeks ago my blazer started squeaking, somewhere throughout the body (I assume). At first i noticed it more with bumps that I hit. I saw that it could be the bushings, but then someone told me today that it might be the Ball Joints. When it is parked if I rock it back and forth I can hear the same squeak....thought this would help with any diagnostic feedback.....thanks!

 

I wish there was a clear answer on this one. I have had the same issue with mine and have lubed all the zerk fittings in the suspension and siliconed all the bushings I can find, to no avail.

 

Mine has one too. I've been unable to locate it either. It's not that bad though, you can't really hear it when driving.

 

My coworker has a 99 4dr jimmy and his squeaks a lot and it turns out that the control arm bushings are worn out. He has sprayed the bushings with some kind of silicone and it goes aways for about a day and then returns.