99 JGC engine shudder after shifting

[alaskaB]

I have a 99 grand cherokee LTD 4WD, and lately, when i am accelerating up a hill, as i approach the top of the hill and the car shifts up to the next gear, it shudders. If i take my foot off the accelerator for a few seconds and then put it back on, the car usually runs smoothly. What's happening here? It doesn't seem to be a matter of the engine being cold, and i checked the transmission fluid level, which is fine.

[Cam7]

Might be going in and out of lockup. Check your RPM when this happens and see how much they go up. Turn your overdrive off and see if it happens.