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Discussion Starter #1
I have an 09 lmm that I want to put 285/70/17's on but I don't want to program it. I know that the speedo will be off by a few mph. I can live with that, but will it cause any other issues? Shift points or abs signal etc. Any help would be much appreciated.
 

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Youll be fine. I'm running 35s with no programmer, no weird shifts, abs lights or anything..
 

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I'm That Guy...
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16,694 Posts
265 and 285 both made my trans shift funny until I adjusted the ECM. It wasn't consistent, but random issues shifting.
 
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