I had the same rear end problem once, after lots of looking, I found that the weight I placed in the rear had come a bit loose. So, on coasting and turning, the weight would rub against the drive shaft into the gearbox.
Also, check how far the cvd dives into outdrive when suspension compresses. If it dives to deep on the outside wheel, it will lock up.
Hope it helps :-)
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...... KYOSHO ......
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