mrdrinksalil

Ok, so from what I hear in 2006 you can only recalibrate the speedo for up to a 285/70/17. 2005 and down you could input rotation per mile and the speedo would be accurate with the bigger tires. Is this correct??? So what options are there for getting a correct speedo and odometer w/ 37's on an 06?!?!?

Texasimport

I think dodge will only help you up to a 285. But get your self a tuner, perhaps a SMARTY. The tire adjust capability was one of the reasons I used to help justify in my mind to spend that money. As an added bonus you get to add some extra HP, and with those 37s you might enjoy it when your in that Georgia mud.

mrdrinksalil

I love the SMARTY Peer pressure. Hahaha.

Bob Wagner

the jr will work well

Catmandoram

I bought the "Super Chip" version called Tireqag.
I'm running 37" and this adjustment worked great!!!
I recommend it highly. It's right on the money.

Fisherguy

So with the BDTD and your 06 will fly with CL (if you're into that kinda thing)

nodakbassmaster

My dealer recal'd mine for my 275/65/20's (34.1"x11) for about $20 and they are bigger than the supposed 285/70/17 limit, they just needed to know how many Rev's per mile the tire made...

mrdrinksalil

In an 06 and newer you can't input by rev/mile.

I posted this up on another forum the other day.

"OK, I went and visited a friend of mine last night who's a chrysler tech. Up until 2005 you could input rotations per mile to correct speedo/odometer. We hooked my 06 up to the computer and you are given an option of tire sizes to choose from, the largest being a 285/70/17. NO OPTION to input rotations per mile. So, we also went into the drop down box for gear selection. My truck has 3.73's but the lowest option in the drop down box was 3.21's so we selected those to furter correct the speedo. I havn't done any math to see how close this gets my speedo to 100% correction, but clearly, the only way to get the speedo 100% accurate is with a aftermarket handheld programmer. I have also noticed that my onboard fuel mileage guess 0 meter is showing 19mpg tank averages when I hand calculate them at 13.3. I'm not sure if this is related or not. "