Accelerating Shudder, HELP?!

Hey Guys! I have a 2006 4x4. I've got a shudder when accelerating around 30-40mph, feels like speed strips on the side of interstate. It doesn't happen every time. I've had my u-joints checked and also just had my rear-end fluid exchanged. I'm not sure where to go from here. Anyone have any suggestions? Torque converter maybe? Any help is much appreciated!

 

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Is the shutter, front, back or to one side? Have you checked the lugs and the leaf u bolts?

 

^X2 & your carrier bearing. "Gazillion" posts/threads with the same problem.

 

I also would guess your carrier bearing. Mine had similar symptoms when it went out at somewhere in the neighborhood of 120xxx.