I've been getting rattleing noise comeing off the front end of the truck. It only happens when i take off but don't hear it while driving over 35mph. Looked under the truck today and when i grab the front drive shaft it moves around and rattles. Is it the U joint or what? Anyone had this issue before any help would be appreciated.

thanks

 

Dont know anything about the front wheel drive system of an s10 blazer. But all others I have ever seen had a real problem if the driveshaft could rattle when moved by hand. I'd fix that thing if I were you. I've never even looked closely at one, but I suspect it has a universal, if you say it has a shaft, then it must, and if so, its gone.