: Can dealer re-program speedometer?



bigwatr
02-26-08, 03:29 PM
I am considering some custom wheels & tires for my 07 EXT but they will probably be slightly taller than my stock 18's. On my Excursion, the Ford dealer re-programmed the computer for the new tire size. Can Cadillac dealers do it too? I don't really want to buy a Diablo programmer just for that.

Thanks.

hcvone
02-26-08, 04:01 PM
Yes they can, but they have limits on their Tech II tool too, lots of "T's" What size tires are you looking at?

bigwatr
02-26-08, 04:15 PM
305/50/20, 32" diameter. Stock are 30.5"

hcvone
02-26-08, 06:41 PM
305/50/20, 32" diameter. Stock are 30.5"

The stock 18" are 265/65/18 they are 31.56" high
The stock 22's are 285/45/22 they are 32.09" high

So no matter which size tires your truck came with putting on 305/50/20 tires will require no speedo changes :)