Truck isnt happy pulling trailer

[Longshot270]

Just curious, have you tried using the comm gear PID while towing? One common misconception is the difference between 4th gear (overdrive) and 4th gear with the torque converter locked (locked overdrive) and then the locked/unlocked 3rd gear. Sometimes you think you are dropping out of overdrive and it is just the torque converter unlocking. Usually there is about a 400 rpm difference between OD and locked OD but could be more if you are towing. If your torque converter is locking just a bit too soon you can move that locking point back in your custom options menu.

[mcwilly]

Originally Posted by Longshot270

Just curious, have you tried using the comm gear PID while towing? If your torque converter is locking just a bit too soon you can move that locking point back in your custom options menu.

Seeing as I have no idea what you're asking, I'd say no I havent tried that. I've looked around the custom menu options but I havent made any changes. First thing I need/want to do is find out my tire size in mm so I can adjust that in the custom settings.

[Longshot270]

Originally Posted by mcwilly

Seeing as I have no idea what you're asking, I'd say no I havent tried that. I've looked around the custom menu options but I havent made any changes. First thing I need/want to do is find out my tire size in mm so I can adjust that in the custom settings.

You can use 2580 as a close starting number. To get it dialed in perfectly get a GPS and clear the odometers on it and your truck. Drive at least 10 miles and then use this little formula: GPS odo/truck odo X tire size (2580 if you program it in before you go).

To pull up the PID for the commanded gear go to settings, display, and then scroll through the list for "COMM GEAR", press enter. Then when you go back you'll see which gear the truck is currently supposed to be in. When you get up to highway speeds you'll see a little lock icon. That means that your torque converter is locked. Then next time you pull your loaded trailer look and see if having the shift/lock points raised or lowered would help. They move in increments of 1 mph because the part throttle shifting is dependent on speed and engine load. If having them raised or lowered would help then you can move them next time you reprogram your truck with the custom options menu.

[mcwilly]

Well, I got a hold of PHP this afternoon. I didnt get to speak w/ Bill directly but I mentioned my problem and he suspected it's exactly what you guys were saying it was w/ the TC locking and unlocking.
Longshot, I found the option in the setup and have it as part of my display now so I'll check it when I pull the trailer again.
Thanks guys for the advice. Hopefully I'll get it tweaked enough to make pulling the trailer a little easier. Think I'll wait till after I receive my custom tunes before I do any major tweaking.....I've got a couple of weeks before I have to pull the trailer with a full load again.
I asked that they point Bill in the direction of this thread...hopefully he'll get a chance to read it.