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Discussion Starter #1
Can the dealer fix the speedo after I put on bigger tires or do I have to have a tunner?
 

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The dealer could fix it for you, but they will only do it if you bought a size of tire that is approved/recommended for your truck by GM. Your best bet would be to get a tuner and fix it yourself. I would suggest a diablosport predator from personal experience - you can dial in your tire size, and I got a bit of a power and gas mileage increase with mine.
 

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like he said get a tuner, not only can you adjust tire size, but many other factors as well, depending on the tuner
 

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Get a Diablo Trinity or Preditor tuner. They have better tunes than the other programmers and they let you adjust more.
 

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x3 on Diablo products....I love my Predator!
 

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Discussion Starter #6
Thanks guys I have a predator for my Challenger, just didn't know which one was better for these trucks.
 
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