going to take my truck back to the dealership to have afew things look at and need to know how exactily to tell him to recalibrate the speedo since he told me one day it couldent be done, will need to know so i can teach him.

 

go to differint dealer! cant recalibrate the speedo, what a moron.

 

What size are the tires? Anything bigger than 285s cant be recalibrated on the 06 and up unless you get a smarty that's the only way to cal speedo for bigger tires.

 

was trying to get this posted as the battery was dieing on my laptop, so i forgot a few things. yes, i went up to the 285/70's bfg's. he said it wasent a option for the 06's

 

I belive I've heard it said(the technical term) as resetting the pinion factor! Then you just add the rev/mi.....correct me if I'm wrong

 

The pinion factor on the '06 and later can't be changed. The '06 and later ECM has a selection of tire sizes preprogrammed in that can be selected. The largest size available is 285/70-17.

 

I think the 285/70R-17 is the factory tire size on the Powerwagon. Because of that, I think they can reprogram for that size.

 

The Powerwagon has different gears.

 

I had my 06 recalibrated for 285's. It can be done. Besides gear ratio, the ECM still needs to know what tire size the truck has to accurately display MPH's.

 

Do a search, someone posted that you can go over 285s by reprogramming the ABS. Don't know how this works, but read several posts on it. Maybe someone will chime in with some details. If I can find it I will post it.

Pete

 

Yes, reprogram the abs module with revolutions per mile of the tire, not the tire size. I believe that is the option when they select other vs. the tire sizes listed. I think the tires.com website has most info on all the popular sizes.

 

Yes, reprogram the abs module with revolutions per mile of the tire, not the tire size. I believe that is the option when they select other vs. the tire sizes listed. I think the tires.com website has most info on all the popular sizes.