Lost

[tadams11201]

iiiiii.

[tadams11201]

Sorry, MAF readings.. not MAD readings.

[tadams11201]

iiiii

[Jackpine]

If you're in 3rd gear, with the Torque Converter locked, the ISS should match the OSS. If not, something's "slipping". So, monitor the "Comm Gear" PID, ISS and OSS to check this. In 4th, the OSS would be higher than ISS with the TC locked and in lower gears, the OSS will be lower than ISS.

Again though, the TC has to be locked, because if it's not, they will always be different.

I'm puzzled when you say it won't shift to high gear (4th) when cruising. Do you mean if you are holding a steady speed at say 60 mph on a level highway the truck never gets into 4th gear? If that's the case, something is badly wrong.

- Jack

[BlackSTX]

One question. You said it will run 16.2 in 1/4 on performance tune, but not on stock tune. I'd say that it isn't an issue with all that stuff that's been changed, but perhaps something with your stock programming.

After all, if it runs fine on the canned tunes, but not stock; everything else with the vehicle is still the same, just not the commands and criteria the ECM is reading and adjusting. This may not be a physical issue with parts, but something else.

BTW, if the dealerships have been in there several times, double check some of the bolts and electrical connectors, looking primarily at grounds, just in case one was missed or is loose.