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Ok im puttin 37s on my truck now i have the dP tuner so will have to get it rebunt for the big tires? and do i have to regear my truck? I dnt pull much
 

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Well if you don't pull much then, it really won't be a big deal. If you did pull a lot I would say 4:56 gears, but there is no need to go that high. I would try it without gearing and if you just don't like how it doesn't pick up and go like it use to then I would re-gear with 4:30s
 

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you should be fine, i got a buddy who has a v10 with 37s and he is fine. and its a gasser.
 

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I have 37 13.50's on my truck with stock gearing and I dont pull anything larger than a 21 foot aluminum bass boat and my gears are just fine. I dont suggest going over 13.5 wide.
 
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