Hello again, I believe it might be time to change this old cars transmission fluid. For starters the thing is like 35 years old. But also I notice there is like a high pitch almost siren like sound from the gearswhen driving. Also, I notice after sitting in traffic to long , the shifter gets a bit sticky and harder to find gears. Maybe fresh oil can help with that ? And would the recommended replacement be dextron 2 or something else better?