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View Full Version : 2009 chev 2500 hd speedo



JST
July 28th, 2012, 02:47 AM
How do you set the speed on this truck,I have reset the ECM/TCM no help,he has 285/75/16 and is 5 mph off ? He has been told we need to get hypertech and that EFI can not chang it ????

ls1mike
August 18th, 2012, 02:34 AM
H0105