I have a 2004 GMC 3500 4X4 SRW. You can feel gigglesin the steering, but it feels like it is in the steering arms near the tires. I had the problem when Ifirst got the truck and I came to this forum and olthers had the same problem. I took it to the dealer and he greased something but I don't remember what it was. Can anyone help? I got the problem again.

 

I worked in a GMC dealer for a while I remember we had to get this special greaser, looks like a syringe, and pushed grease in the steering shaft....something to check out???...wish i could help more