Hey guys! I'm picking up a 94 Deville with the Northstar 125k miles for my son. I believe it has the 4T80 tranny from my research here. My son used to wash this car for our neighbor and always drooled over it, so it's kind of special for me getting this for him.

Owner said he had tranny replaced 1500 miles ago. Ever since he got it back in the mornings it clunks pretty hard when removed from Park (where in sunny Florida so it's not cold). He said once it warms up and gets going it's perfect. He said he never took it back in time and warranty is over. I'm waiting for the car to get here, but I'm trying to do my homework by the time it gets here.

Any ideas?