What is the requirement when you install a new transmission on a 2004 Ford Taurus

Wanda, Check out the video and links I posted to see how to remove and replace Taurus water pump.
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How to Install Water Pump Ford 3 0L V6 FWD WP 9038 AW4094
Ford Taurus Water pump Replacement
Need step by step water pump change
2004 Ford Taurus water pump Google Search

very low tranny fluid level can cause a trans to require to be rebuilt

It sounds like the gap between the starter gear and flexplate is growing. The ring gear may be worn out in spots causing the starter not to engage the (shortened) teeth of the flexplate. Or the starter is shimmed too far from the flywheel ( less likely ).

The flexplate problem will require the removal of the transmission to repair.

http://www.carpartsdiscount.com/auto/parts/2004/ford/taurus/flywheel_flexplate/flexplate.html?3593=247290

The part itself is not that expensive, however, the labor to replace will bite you

Need a whole new transmission, ASAP. It's a 2004 Taurus; Their transmission's tend to start slipping after so many years.

Change engine oil and replace oil filter.

Inspect tires for wear and rotate.

Inspect brake pads/shoes/rotors/drums, brake

lines & hoses, and parking brake system.

Inspect wheel ends for endplay and noise.

Inspect engine cooling system and hoses.

Inspect exhaust system and heat shields.

Inspect steering linkage, ball joints, suspension

and, if equipped, half shafts, driveshaft and

U-joints.

Replace engine air filter.

Replace fuel filter..

Replace cabin air filter, if equipped.

Change automatic transmission fluid on vehicles

equipped with the Torqshift and 4R100

transmissions. Replace the remote filter element

on the vehicles equipped with the Torqshift

transmission. Inspect automatic

transmission/transaxle fluid level on all other

vehicles, if equipped with dipstick. Consult your

dealer for your particular requirements.

Change automatic transaxle fluid and filter on all
vehicles equipped with CVT.

Check the fluid level first.

The torque converter could have failed. But, the transmission should be checked out at a transmission repair shop to be sure.

Yrs, Have the pan dropped, the valve body dropped and gaskets replace , new filter and oil. It gets deep and expesive beyond that Make sure the oil level is correct and there is nothing wrong with the linkage before going further., Like first. Good luck

You add transmission fluid through the dipstick opening for the transmission... you need a long neck funnel to do so.. they make a transmission fluid funel that you can get. Be careful not to over fill!

You can try to replace with a similar unit, but typically Ford ECUs have to be "reflashed" by the dealer. Ford has numerous calibration codes and various other vehicle specific information that can only be managed with Ford certified (dealer) programing devices. I hope this helps