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I just bought my first duramax its a 2006 LLY 3500 4x4 dually. It had 228,000 on it when I bought it. It seems to run great and mileage around town is 15mpg. But labor day weekend we took on a road trip about 1000 miles total. It got almost 20 mpg I never got that out my gas motor. My question is how can I tell if any modifactions have been done to drivetrain. The guy I got it from was the 2nd owner he had the turbo replaced at 215000. But he said nothing else had been done by him.
 

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:welcome Just so you know, an 06 is actually an LBZ, it's just tuned from the factory with an LLY tune
 

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Welcome, hope you enjoy your rig!

A free flowing exhaust and tune always helps a bit. Plenty of options here, if you have any questions feel free to ask! Also, fill out your signature with your truck's details so we can better have an idea to go on in the future :thumb
 

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Welcome to the DF

Sent from my DROIDX
 

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Welcome to the forum


- Adam
 

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Welcome to the DF !
 

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Welcome and congrats on the truck!
 

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Welcome to DF. That's awesome mileage for a dually!
 

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Welcome to the forum
 
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