Not sure what this is
 

Hello guys, I've got a 2000 Blazer LS 4WD and I know I need to replace this part but I don't know what its called so I'm going to attach a picture. I hope you guys can help me out as I'm trying to get this done before a 500mi road trip that I have coming up.

Thanks in advance!

Easy fix those are you "end links". Cost about $20 at your parts store. Try and get the polyurethane set they last longer and are much better than rubber.

Yep,sway bar links and bushings.

2000 Chevy Blazer Sway Bars, Links & Stabilizers - Aftermarket & Genuine OEM

I agree sway bar end link and bushing. But was one already missing?

Definitely want it fixed before going on that trip. Might want to check the rear one also.