What causes my driveshaft to "jump" in this video?

I'm trying to track down a "whining" noise I can hear when driving. I put the car on jack stands, lifted the differential, and ran the car up to about 40mph, trying to see if I can recreate the noise. I didn't hear the whining sound, but my driveshaft jumps at the :37 mark. Thoughts?


every time your drive shaft jumps your wheels lock up. are you hitting the brakes? If you are not braking it might be the clutches in rear. did you change fluid? if so you need special lube additive for the sure grip clutches. Could be pinion don't worry about crushing anything the torque setting is 250 ft.lb. the clutches also make a whining noise if lube is not added. I would get the sure mopar sure grip lube and put it in it's only a few ounces but it is costly.