I was told i need to replace my tensioner pulley so i bought one and i was just wondering what i needed to do to replace the pulley and if there are any special tools i might need.

 

...just a wrench to take the old one off (one bolt) and put the new one on. use a ratchet to loosen the the tensioner to take off the belt (you should see a square hole in the tensioner to put the ratchet in)...try to make note how the belt routes b4 pullin it off...it's not a big deal if you forget cuz i can tell you how it goes back on...

 

If it's not on the truck somewhere just draw the pulleys on a peice of paper and draw the route of the belt on them.