You need to put a little more detail in. What engine do you have, and what engine did the 99 have?
No.
A 1999 Dodge Ram transmission does not have an input speed sensor.
No
No
Yes
The transmissions are the same. The torque converters are different.
No. The control solenoid and sensors are not the same.
It is inside the transmission, on the valve body.
You add the fluid down the dipstick tube.
Mopar ATF+4
V6 has a 42re V8 has a 46re
A 1999 Ram automatic uses ATF+4.