general problems of the 2006 Nissan Quest

I have a Nissan Quest 2006. My mechanic told me that my front sub-frame is all rotten and needs to be replaced.

My 2006 Nissan Quest has bad jerking in the transmission when the gears change. It does this when it both gearing up and shifting down at any speed. The jerking is very bad when also coming from reverse to drive. This is a safety concern for me and my family because if it gives out on the expressway, it could cause an accident and that puts my family including my baby in danger. Also if I am stranded on the side of the road with my child in extreme heat or cold this also puts my child in danger. This transmission needs to be recalled seeing is how I am not the only one with the complaint.

Car has been bought in 2010, it had all the time suspension problems, now appeared a/c cooling system is not working. Does it have any warranty for it? vehicle has about 115,000 miles.

As you start off from a stop the transmission jerks in the lower gears, the speed surges then goes back down and there is an infrequent knocking noise. The transmission also starts to gear down as you go down a decline at speeds of 45-50 mph.