At first the automatic transmission of my 2001 Pathfinder started to 'clunk' with a few seconds delay in D. Someone suggested it would be the U-joints, but that's not it.
Now it got worse: I can't pull up in D anymore. Now I have to put it in 2, pull up and then in D when it's in 2nd gear. I've checked the oil level of the transmission and that seems ok (assuming the level stick has to be pushed back entirely till it's in the clamp again to get the level? Not only till the rubber hits the pipe?). Could it be the oil got old and thinner? Or is it more likely the oil pump is worn?