Review on Enhanced Performance ACDelco Professional Automatic Tensioner – Model 38159 by Matthew Flores

The front end of my 2006 GMC Sierra 5.3 made the same squeaks as many others. I replaced the large idler pulley and that eliminated a noise, but I still heard a slightly weaker noise. I removed this pulley and found it to be difficult to turn causing the small AC belt to drag and squeak. I also added the 38158 tensioner to the order because I figured I might as well replace the last of the three pulleys while I didn't have a tool. The parts arrived quickly as usual, were packed in original Delco boxes and fit perfectly. Again great work by Revane :-)