my blazer vibrates randomly and when it starts vibrating it will stop if i give it more gas or let off the gas. I have been told by one mechanic that it's the torque converter and from another that it's the rear wheel bearings. I don't have any clue whether it's either of these but it's been doing it for about 2 years and i would like for it to stop. Any information would be appreciated.

Check your U-joints and motor and transmission mounts.

sounds like a U joint to me , I had the same thing and I thought it was because of a dry tranny but I nursed it home and did so much damage to front drive shaft that it had to be scraped .