??????? about tire size

[01blkL]

I bought my truck with 20's from the dealer. They said they were the same size as factor.( over all diam.) My question is if the tire size is off will this mess up anything else besides the speedo.??? Like shifting cal., boost anything??? Thanks for your help. Yes the speedo is off....... the dealer was wrong. What a suprise....

 

[FlaSVT]

You should be able to get it adjusted for the difference in tire size by the dealer or you should be able to get a tuner to make an adjustment for it if you are running a chip.

 

[99BlackBolt]

A chip will correct the speedo and the shift points of the transmission... The boost should not be affected by larger rims/tires...

Later, Justin