I see where it says to go back to stock if you take it back to the dealer for service. What if i switch gears to 4.10 and tune my truck. If i go back to stock to 3.21 hows the truck going to work. I dont understand why we need to go back to stock. Also, how bad does this screw up the warranty. Can they tell the computer has been switched?

 

There have been a few threads and opinions. Here is my experience just two weeks ago.

Reflashed back to stock on Sunday, drove truck to and from work Monday - Thursday to put some drive cycles on it. Took it in for final warranty work at 35k before the 36k warranty expired, asked again for any PCM updates for MDS since I cannot stand this thing dumping into MDS mode at 30 MPH. They checked for error codes, had it hooked up to starscan and no updates were available for my PCM. Service manager is a former tech, pretty knowledgeable and never said a word on if my PCM was updated recently. We also talked about the lifetime powertrain warranty on the truck and what it really covers. So, I assume here, no mention of it means no knowledge of it.

Took it home, reflashed my tune on - done.

Now, I never brought it in for service that would suspect I broke something by tuning it. I keep it on the superchips setting for the trans tune ( only because I do not have time for building my own shift schedules and tried the posted ones that were too aggressive for a daily driver - imo. ) Torque mgmt is set at 8%, these Dodges do not shift hard at all, ( Ford tunes allow you to set shift pressures ) and run the 93 tune since Sunoco Ultra 93 is only 10 cents more a gallon than the 89 you are supposed to run if you want a stock 390 HP hemi. I drink cheap beer and do not smoke, so $3.00-$4.00 more for a fuel fill up with 93 octane to run a max performance tune is not a big deal here