Transmission problem
1999 Honda Accord 4 cyl Two Wheel Drive Automatic 210,00 miles

My car has 210,000 miles on it, when i put car in reverse it has limited power and is only able to reverse 3 and 4 feet at a time when accelrating, otherwise i can still reach top speed when driving, should i replace the entire transmission? also my car is starting to overheat, more so when ac is turned on, most likey a thermostat? all fluids are good