You can also save some agravation by renting the belt tool from Autozone or some other parts place. It's a really tight fit for wrenches and socket sets.
I used an offset box end wrench of 15 mm (when i´m not wrong about the size) to unload the tensioner and remove/install the serpentine belt on my 4.7 When doing this, take care in not letting the tensioner go back to its stop with force, because it can/will damage the tensioner.
Sofar i´ve only heard good things about the Goodyear Gatorback belts. They seem to be more flexible and making less noise then the standard belts. I have just ordered one myself. Gatorback for 2006 3.7 WK is $ 28,79 at Rockauto.com
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