Is the Transmission sealed, can not change the filter and fluid? Where is the radiator, is it also sealed, can water only be put in the overflow?

The transmission is not sealed in the v8 I looked up. It's bolted together. Fluid Pan Removal & Installation To Remove:

1. Before servicing the vehicle, refer to the precautions in the beginning of this section
2. Raise and support the vehicle
3. Place a drain pan under the transmission fluid pan
4. Remove or disconnect the following:
   • Drain plug and drain the fluid
   • Shifter cable bracket NOTE: The transmission fluid pan gasket is reusable, clean and inspect for damage; if not damaged, the gasket should be reused.
     
   • Fluid pan and gasket
   • Transmission fluid filter
   • Clean and inspect the transmission fluid pan and magnet
   • Converter housing access plug
   • Converter drain plug

1. Install or connect the following:
   • Install the converter drain plug. Torque to 89 in-lbs (10 Nm)
   • Install the converter housing access plug
2. Lubricate the seals and install the transmission fluid filter. Torque the bolts to 89 in-lbs (10 Nm)
3. Install the oil pan magnet in the transmission fluid pan NOTE: The transmission fluid pan gasket is reusable, clean and inspect for damage; if not damaged, the gasket should be reused.
   
4. Install the transmission fluid pan and gasket and loosely install the screws.
5. Using a crisscross sequence, torque the screws to 8 ft-lbs (11 Nm)
6. Install the shifter cable bracket. Torque bolts to 18 ft-lbs (25 Nm)
7. Install the drain plug. Torque to 19 ft-lbs (26 Nm) NOTE: It will be necessary to hold the drain plug (larger plug) with a wrench when removing the fluid level indicator plug.
   NOTE: Use 3/16 inch Allen key to remove the fluid level indicator plug. Remove the fluid level indicator plug.
   
8. Verify the transmission fluid level