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Check the 3500 Dually Section. I think you will find this talked about in there a few times. Not sure myself. Maybe someone else will chime in. But since you are asking a Dually question, I think you will get more answers and find more info in that section. I can move this thread there if you like?
 

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what is the biggest tire you can put on a stock 06 chevy Dually.

Thanks
there really is a lot of info on this issue, but here's a quickie answer for options:

1. 245/75/16's - need a spacer between rear duals
2. 235/85/16's - might need a spacer between the duals under load
3. 255/85/16's - will need spacer in rear and a PCM program
4. 265/75/16's - will need spacer no PCM programming(maybe)
Combo's:
1. 245/75/16's front and stock 215's rear - don't need nuthin'
2. 235/85/16's rear & 265/75/16's frt - might need spacer for duals loaded

After this it's all crazy stuff and you'll probably need after market wheels.
JP
 
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