To start off, I've seen a variety of other posts around the forum in different places describing the exact same issue.
I have a 2005 Grand Cherokee Limited with the 4.7L V8 and the five speed auto trans.
Sometimes, when going up hills, usually steepish ones, the transmission will be very hesitant to downshift. When it does this, one of two things happen: A) It merrily torques it's way up the hill, or B) It experiences this shudder. To elaborate: the truck will shudder inconsistently, almost like it's missing on several cylinders. However, this sometimes progresses to either a heavier shudder all the way to a hard jerk (This will only occur once before it downshifts, if at all). Once it kicks down, even a single gear, the issue vanishes and the engine runs as strong as ever. Given that this only happens under 2,000 rpm, I'm tempted to blame a faulty torque converter, as it intermittently disengaging and reengaging could produce the effect. The only issue that may be pertinent is that there is a tiny bit of driveline slack that you can feel whenever you accelerate rapidly from a stop.
If there is anyone who as actually managed to fix this issue, advice would be greatly appreciated. I have not taken the vehicle in for the transfer case programming recall due to all of the comments on this forum describing the ensuing nightmares. Any advice would be appreciated, especially if someone has managed to solve the problem.
'05 Grand Cherokee Limited packing a 287. K&N FIPK II | Fastman 68.5mm throttle body | Borla ProXS muffler
About 260 horsepower, 320 ft. lbs. of torque. She's no race car, but tons 'o fun nonetheless.