Slight jerk from back end when accelerating hard
My 2005 KJ has started making a slight jerk from the back end when you're moving slowly - say about 20-30 mph - and then open the throttle up. There's no wheelspin or noise, just a slight sensation of the back end "catching up" with what the engine is doing. It only lasts a fraction of a second.
Is it likely to be a driveshaft or (gulp) diff issue? It's still on the original rear driveshaft, although the front was replaced about 2 years ago. The trans was rebuilt less than six months ago, so I'm not thinking it's a transmission problem.