Today I noticed that our 5R110 was delaying slightly when shifting from drive to reverse. It was probably about a 1-2 second delay but it replicated itself twice in a row. There was no delay going from reverse to drive. It is just an engagement delay. We are running a Superchips Heavy Tow tune on the truck, it is a 2006 6.0 Powerstroke. Has anybody encountered this before?
How many miles on this truck?
Have you checked the transmission fluid with the truck warmed up and running on level ground?
Does the fluid smell and look burnt?
Maybe time to service the transmission with fresh fluid and filter..