| Speedo corects - 04 diff. from an 06?
I put 265's on my new truck so the speedo is off roughly 3mph @ 60. No big deal My bullydog fixed it in my last truck - i've tried it twice but no matter what I choose for a tire size it won't change ne thing?
Is the computer different on a 04 to a 06?
I am going to try updating my bullydog to see if that works. Its not off much, but I like to figure out my fuel mileage & trips & stuff.
Thanks for any help 
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2005 GMC Duramax CCSB SLT. White / gray, roof, leather. All stock for now.
*SOLD*2004 GMC Sierra 2500 SLE. Regular Cab. Black / Gray, LLY Duramax, EFI LIVE, Kennedy 4 into 5" exhaust, 6k HID's. 20+ MPG tire smoking monster!
*SOLD* 2008 GMC Sierra 3500 SLT - Crew Cab Long Bed SRW. 8" Fabtec Lift, 24" wheels, 37x13.5x24" Toyo open countries, Dynoflow exhaust, Air raid CAI, Bullydog PMT.
*SOLD* 2006 GMC Sierra SLT. 4x4 Crew Shorty LBZ DMAX. Burgundy / Tan Leather
*SOLD* 2004 Chevy Silverado LT. 4x4 Crew Shorty LLY DMAZ. Charcole / Gray Leather | 
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