I have a 84 t bird was a 3.8 switched to 5.0 awhile back. My problem is when I’m cruising it I notice the car will pull like normal than all of a sudden cut out and slip for a few hundred rpms and than catch and pull normal. Even under WOT the car pulls great than the trans slips a tiny bit and than starts pulling again. The fluid was changed 300 miles ago and I checked it today and it’s clean and full. I never removed the trans from the car when I got it. Any ideas? Thanks