I am having a problem with my nissan when i am driving on the free way my vechicle gets unstable it feels like it is going to flip over please help me

Likely an issue with the transmission. Check the transmission oil level with the engine running. If too high or low, then have a garage check your system. The 6 is sometimes prone to obvious transmission wear around 150,000 plus km.

check your lug nuts. also check the axle shaft joints.

someone has to put their eyes and hands on the vehicle, soon. take it to a shop which does alignments and ask them for a price to fix it. call around and find a nearby place which does free estimates first. then you will know what is wrong with it. could be a number of things, all of them quite dangerous to drive with.

A BAD THROTTLE POSITION SENSOR WILL CAUSE THAT PROBLEM.HAVE VECHICLE CODE SCANNED FIRST BEFORE BUYING NEW PARTS.

WHEN FINISH REPLACING BRAKE PADS.MAKE SURE MASTER CYLINDER COVER ON FLUID LEVEL OKAY.YOU PUMP BRAKE PEDAL UNTIL BRAKE PEDAL GET FIRM HARD.IF BRAKE PEDAL KEEP GOING TO THE FLOOR YOU HAVE AIR IN THE HYDRALIC BRAKE SYSTEM.BRAKE SYSTEM NEED BLEEDING.DONT DRIVE VECHICLE IF BRAKE PEDAL FEEL SPONGY OR GO TO FLOOR.

HAVE TRANSMISSION CHECK OUT.BY IT BEING A 2009 VECHICLE THE POWER TRAIN WARRANTY SHOULD FIX IT.BUT FIRST CHECK FLUID LEVEL FIRST TO MAKE SURE ITS NOT LOW.IF DEALERSHIP SEE ANY NEGLECT OR ABUSE TO VECHICLE.THE BILL IS ON YOU.

lOOK BEHIND THE GLOVE COMPARTMENT. Compartmet is probabily plastic and all you have to do is push in real hard to get them past dash board.

You are going to have to get under there and give everything as good look. Check all bushings for wear and looseness, check springs to make sure they aren't broken and check struts for leakage. Struts are gas-charged and if one has leaked out usually there will be residual oil at the top where the shaft goes in. When checking suspension, check with wheels supported (on ramps) and check free (jack under chassis, wheels and axle hanging) Don't just look...try to move stuff to see if there is any play there.
Personally, I wouldn't drive it 'till it's fixed. In an emergency situation you will loose control if the back end isn't tracking correctly!

I suggest that you visit the autozone.com website and register the car. It doesn't cost anything and you will have access to an online repair manual for the car. Pretty handy. The steps for replacing the brakes should be available there. Hope this helped and best wishes.

I suggest this is the Vechicle Revolution Sensor is causing the problem.

Run Diagnostic on the Transmission and review error codes.

An error (1) Code would confirm this.

If no error code exists then the problem is the band needs tightening. The gear to slip is always 2nd gear in this vechicle first then other latter as the problem becomes worse. There is only one band in the transmission and it is fairly simply procedure to complete but you need 1-10nm Torque wrench and to remove the valve body to get access. Don't attempt if you don't have good mechanical skill or have exp. on motorbike or other auto transmissions.