Today was a frustrating day in the truck repair world. I have a 2001 Ford Ranger 4WD 4.0 with the 5R55E 135k on the clock. I have had a slow engagement issue in forwards for some time now. It can take up to a minute of reving the engine before the transmission would engage into forwards, usually requiring you to lock the shifter into 1st. Reverse is instantaneous. Once it shifts, it is strong, shifts like always, and will pull down a house. I had no codes. I felt pretty confident it was a solenoid issue. I pulled the pan, no shavings or anything awful. Oil was clean and red. Smelled good too. I've smelled dead transmission's oil and it is awful. I replaced both the EPC and TCC solenoids. I performed the 3-22-10 update bulletin from Ford, fixing the pressure issue and using a bonded plate. It all went together well but still is delayed shifting. Reverse is just as good, shifts gorgeous with the update (wish I had done it sooner actually) but it takes forever to start moving. So what is wrong? Is it a torque converter? Can a torque converter fail in forwards when reverse is actually the higher fluid demand?