My pathfinder is shuddering between 40-65mph, trainy is shifting fine and OD button does not remove shudder when turned off acts normal. I checked radiator and overflow coolant tank no signs of contamination. It has 118K miles on it. Could it be the u-joints going bad. The shudder is only under load. When you let off the gas it smoothes out and when you put it in nuetral at 70mph it is very smooth no noise or vibration. I have read a lot about the trainy cooler leak. I should probably go ahead and change the radiator for a proactive measure. Can someone give me a possible direction to go. Thanks
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