Ok, so a little about the truck: It's a 2015 RAM 2500 Laramie Limited with the 68RFE. 139k miles.
I don't know the mods because I just bought it a month ago, and the dealer I got it from didn't know what had been done to it.
DPF/ def deleted with a 4-inch downpipe back straight pipe.
No tuner came with the truck, so I'm running a mystery tune. I will be getting it tuned by Dr. Diesel as soon as I know that I'm not about to have to replace a tranny.
I can't afford to do both right now.
So this week, I got to take the truck out for its first long trip since I purchased it.
The truck ran fine, shifting mostly smoothly with no shift flare.
However, after about 3 hours of driving (north Georgia mountains, no trailer, and just a backseat load of gear), the truck started acting like it wouldn't shift. 1-2 was fine, but it stayed in 2nd and would not upshift for like a solid ten minutes regardless of the road's incline or how much throttle I gave it.
Eventually, it shifted into 3rd and then again seemed like it wouldn't upshift to 4th.
After about 60 seconds or so, this time-shifted to 5th, then 6th, no problem.
Trying to use the manual shift buttons didn't seem to help.
The truck continued to stay in 2-3-4 for like at least 30 seconds before shifting up while downshifting fine.
We pulled over, went inside some stores, and gave the truck an hour to sit. After the hour, the truck drove much better, with only 1 or 2 shifts delayed for the last 20 minutes of our trip.
Over the next two days, the truck drove fine on short trips around town, but it was the same story when we came home.
After about 3 hours of driving, the truck would stay in gear for a very long time, like 30-45 seconds, before shifting up when going into gears 3-4-5.
Any help in diagnosing my problem would be greatly appreciated.
Bookmarks