luv2xl8

i had an fluid exchange service done.i got the tranny oil from the dealer.it had about 2quarts over in the tranny and i ran the car for about 12k with all that extra oil.today i drove the car and when i was going 30 mph i threw it into nuetral and i started to hear the shifter clicking (the click you hear when you press the brakes to take the car out af park) very fast and when i came to a stop it started clicking slowly.i have 90k miles on the car and the tranny oil dosent have any burnt smell or look dark.could it be the tq converter?