At what millage should i change the automatic transmission fluid? The car is shaking when i put it in drive it dosnt shake when is in parking i need to put it in neutro everytime i stop in a light so it dosn't shake so much, it dosn't have power (it's kind of slow).

I assume Automatic Transmission?
Today's Cars are very particular about correct CLEAN fluids
AND filters!

"ATF" in most cases means Automatic Transmission FORD
Someone has done a transmission service with FORD transmission fluid.

The damage is done, there is nothing I can do for you.

However, you can try flushing the system of ATF with Dextron III
Automatic Transmission fluid at a Oil service company.
This will flush all the Damaged parts through your already damaged Transmission into the filter, doing further damage to seals and... along the way. Plus change the Transmission filter.

Bottom line;
Regardless of correct Fluid, The Transmission fluid IS dirty,
The Transmission needs clean Fluid and filter changed to run correctly, In any case; This may save what ever is remaining of your Transmission's life or not and your Car won't move at all.
OR you could do nothing and the Car May run another 30,000 miles or another 300 miles.

IF after doing a Transmission service the car won't move,
you can try putting the FORD Transmission Fluid in, which is an old trick to TEMPORARILY fix old worn out Chevy Transmissions.

Your Choice :)

I suggest playing the Slots at a local Casino first, to see how your luck is going before making a decision.
GOOD LUCK!

with engine running at operating temperature,put car in park ,then check the oil level,if it is not bright red ,or brownish,very dark red,or smell like rotten egg,you have to change the fluid,or have the shop do it,if your has high millage,DO NOT FLUSH THE TRANSMISSION,just change it

Tune up spark plugs, wires, check fuel filter, etc... Check distributor, change transmission fluid and coolant. If you need a new distributor I would try looking for a used one online.

Transmission fluid should be changed every 30,000 miles, or more frequently if the vehicle is used for towing or carrying heavy loads.

When replacing the transmission fluid, first the mechanic drives the vehicle to get the fluid warm and then removes the drain plug at the bottom of the transmission (if applicable), or removes the transmission pan allowing the fluid to drain.

The transmission is then filled with fresh fluid, and the engine is started. With the engine running and the transmission in "Park," the mechanic checks the level of the transmission fluid on the dipstick. Then the vehicle is driven once more, and the fluid level rechecked; if needed, more fluid is added.

Using the wrong automatic transmission fluid may invalidate the manufacturer's warranty and affect the shift characteristics of the transmission. Consult the owner's manual for information on the kind of fluid to use.

Many automatic transmissions have a filter that can be replaced when changing the transmission fluid. Changing this filter may allow a closer examination of the fluid for debris, which may be a sign that the transmission is about to fail.

Hope this helps.

for the most part its just basic maintenance but after a certain millage you should have the timing belt replaced to avoid major engine damage same goes with the transmission a fluid and filter should be done after a certain millage. check your owners manual for the millage and servece

check for transmission dip stick or fill plug fill and check level

use only Mopar ATF 4 automatic transmission fluid MS-9602

you have to remove the trans pan to drain and replace filter the fluid get refilled at the dipstick tube {drivers side rear of engine- black } with filter it should take 6 qts

At that millage you will need to change the oil, transmission fluid and engine coolant. You should also possibly change the timing belt and water pump. Check you owners manual for any additional services.

it all depend on the millage, and how dirty the oil is

if oil very dirty it will be worst for your transmission