When ever I put the car in D, it vibrates, if I put it back in N or P it is fine again. Also when driving I have alot of vibration at the speed of around 35 to 40 mph but it goes away if I increase or

if there is vibration on the steering when you braking then there is problem with brake discs they could be overheated and not straight. If there is a vibration on your steering wheel on slower speeds then it can be tyre damage or rim

It sounds like the idle speed is set too low, and it is taking the PCM a few moments to figure the correct setting. If the engine is new, or new to the vehicle, perhaps the engine idle speed setting is incorrectly set too low.

U joints get worse as speed increases. You can try replacing the mount for the transmission it may help. Also check to see if the drive shaft is damaged.

Possible dirty throttle valve and idle speed control valve.

Throttle Body Cleaning on vehicles without electronic throttle control (most 2003 and down)

You can in most cases repair this slow speed stall or unstable idle by cleaning the engine throttle valve and the idle speed control valve using a product called CRC Spray Throttle valve cleaner. Spray the cleaner into the air intake of the engine with the hose removed from the throttle body, the engine will try to stall so hold up the idle speed manually. Once you have used up about 1/2 can of the cleaner stall the engine out while spraying and turn the key off, disconnect the negative battery cable for 5 minutes and then reconnect and drive the car for a about 25 miles of varied driving modes. If this doesn't cure the problem you may need the fuel injectors professionally cleaned by the dealer service dept.

The pinion bearing has escessive preload. When this happens there excessive vibration.On 4x4 the front and the rear drive shaft has to rotate at the same speed. you are mainly locking up, the pinion is not moving freely

i really recommend a trans service/ band adjustment to correct your problem before you go thru another trans, almost sounds like a problem with torque converter being out of balance/ damaged...

try fuel filter first.

bad engine mount make car shake.cylinder misfire make engine shake.

any way you feel vibrations travel in whicth speed?
if it is up then 90-100 kmh get your tires balanced ,(they put a piece of metal in them to not vibrate in high speed) if you have done this, see how is your alignment tires. if this have done see your arm steering , you have them problematic(losting fluid inside, or if you have hited something hard with your tires.

Need to check lower control arm bushings and rear struts..

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