I have a 99 s80 nonturbo and I am getting ready to do the transmission fluid and filter change. Does the car have the 4T60-E or 4t65-E trans.? Also, about how much fluid is needed just when you drop the pan and then refill again?

 

you have the 4T65EV if not geartronic, or 4T65EV-GT if you do.
a 4T65E tranny is the original GM tranny, which has several changes made to it such as construction of the differential.