Here at John C Garage, we like to solve problems! Not only do we solve problems, but we make them better than factory. With the 2017-2025 Duramax L5P, we have seen time and time again the plastic pulley on the factory belt tensioner fail and leaving the truck inoperable! (see 2nd photo for example) We have come up with a metal steel pulley that can directly replace the plastic pulley that is prone for failure! Even if you haven't experienced this failure yet, this is something you throw in the glovebox or under your back seat for when it comes time to replace! It's also not a bad idea to change preventatively because when your factory plastic pulley does fail, it can take out the clutch fan wiring with it which can be a much bigger issue than a simple pulley change.

This listing is for a brand new AC Delco tensioner paired with our metal pulley. If you do not need the tensioner, head to our website where we sell that by itself. We also sell it on our website as a complete package with brand new AC Delco serpentine belt too!