Which brand of programmer/tuner is best for my 2009 1500 4x4 slt sport with the 5.7 HEMI.Many friends have suggested bully dog,but I would like input from you guys.What about the trinity,or diablo........

 

So far everyone has had good luck with superchips. I know when diablo first came out there were several issues. The bullydog seems pretty good also but I would go with superchips.

 

Does anyone know up to what size tires superchips programs? I would like to get my speedo right running 35's.

 

i think it goes as high as 40's or so. i am running 37's and it works just fine. i have the superchips myself and it is awesome. highly recommended. most of the people on here have gone with the superchips. i would go with that one if i were you.

 

It'll cover 35's. I can't remember what to goes from/to to well but I believe it'll cover everything from 31 to 40 in 1/4 of inch increments. That's if it hasn't changed since 2nd gen trucks. Directions actually tell you to measure to tire to get correct reading.

 

Make sure to double check your speed after changing it. I have the 20" rims and tires and the stock setting on my superchips put them at 31.5 inches tall and they actually measured around 32.5 so I changed it and it made my speedo read too fast so I had to change it back. And yes I checked my actual speed with my friends radar while he was on duty.

 

If you have an Android phone with GPS, there is a program called Speedview(its free). Its uses your GPS to give you a current display of speed, distance travelled, and direction.
It even runs a graph chart so you can do quarter times without looking at the phone, and know how fast it was.

 

Nifty info! I just downloaded that app to my phone. I will check it once I put my program back on my truck to make sure I am running true.