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Discussion Starter #1
Hey guys and gals, I recently got a 2009 GMC slt crewcab LMM duramax (used) has 13,000miles.

Question is, when driving down the road, not hammer down, there's a "click" sound when it shifts to 3rd? around 30mph, any ideas??

Also this thing makes a weird nosie when cutting it off, i dont even know where to begin to explain what is sounds like, coming from under the hood.

Thnks for the help!:thumb
 

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Discussion Starter #2
So I found this video on youtube THIS IS THE SAME SOUND MY TRUCK MAKES....In this guys comments it says this is a normal sound for the LMM.. TRUE or False??

 
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