Re-program after changing tire size?

[danny68327]

I have a 2014 1500 Silverado that came with 265/65/R18 (31.6") tires. I would like to change to either a 275/65R18 (32.2") or preferably a 285/65R18 (33") tire. Will I need to re-program my truck? If, so will chevy do that for me? If I don't, will it cause any damage? Thanks for your help

[Jsdirt]

Most aftermarket performance programmers have that parameter in the unit. If you don't get it right, the speedo will be off, and your dash will light up like a Christmas tree with check engine & ABS lights ... and you'll lose ABS function. Ask me how I know that one!!

[RyanbabZ71]

Gm will not reprogram. You have to go aftermarket

 

Also look at a 275/70/18.i am running that size on my 2010

 

 

Ryan

[danny68327]

 

 

Most aftermarket performance programmers have that parameter in the unit. If you don't get it right, the speedo will be off, and your dash will light up like a Christmas tree with check engine & ABS lights ... and you'll lose ABS function. Ask me how I know that one!!

 

Thanks. What was your original tire size, and how much bigger did you go?

[danny68327]

Gm will not reprogram. You have to go aftermarket Also look at a 275/70/18.i am running that size on my 2010 Ryan

 

 

 

I would like to go 275/70/18 but i'm hesitant to use such a tall tire. I tow a trailer and I'm afraid it will have a negative affect on on the gear ratio (I have a 342).

 

 

[MikeNH]

I went to 275/65/18 from 265s and it is off by like 1 MPH at 80. Below that the speedo matches GPS.