This truck has a 351 AT with 145000 miles. I have not pulled any codes to see if it has any. When you put the truck in drive or reverse from park sometimes it goes in "hard". You can feel it jump and it it just kind of feels like a real bad u joint when you put it in gear but it is not. Warm or cold it will do this every now and then. I have no other tranny or drive line issues. Any ideas? Thanks!

 

Just want to bring this back to the top to see if anyone has any ideas. Thanks!